<p>&nbsp;</p> <h1>————<strong>提高组</strong>————</h1> <p>&nbsp;</p> <h1>第一题:deco的abs</h1> <h2>题目链接:<a href="https://ac.nowcoder.com/acm/contest/934/A" target="_blank"><span style="text-decoration: underline; color: #ff0000;">https://ac.nowcoder.com/acm/contest/934/A</span></a></h2> <p><span style="font-size: 18px;">因为每个数都可以加任意次 d ,所以可以推出 0&nbsp;&lt;= 相邻两个数的差值的绝对值 &lt; d &nbsp;,于是我们先让所有数对d取模</span></p> <p><span style="font-size: 18px;">再枚举每个位置 ,用 last 记录上一个数的值 ,然后求 abs(a[now] - last) 、abs( a[now] + d - last)、abs( a[now] - d, last )即可</span></p> <p><span style="font-size: 18px;">下面贴代码:    </span></p> <div class="cnblogs_code" onclick="cnblogs_code_show('7821cb70-b844-43a9-9413-df114537236f')"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850150923_BEE14B9FE62E4101C719260C64AA4C83"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850150948_BE319C0086E6D58007898F5FCE19C980"> <div id="cnblogs_code_open_7821cb70-b844-43a9-9413-df114537236f" class="cnblogs_code_hide"> <pre><span style="color: #008080;"> 1</span> #include &lt;bits/stdc++.h&gt; <span style="color: #008080;"> 2</span> <span style="color: #0000ff;">#define</span> ll long long <span style="color: #008080;"> 3</span> <span style="color: #0000ff;">const</span> <span style="color: #0000ff;">int</span> N = 1e3+<span style="color: #800080;">10</span><span style="color: #000000;">; </span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">using</span> <span style="color: #0000ff;">namespace</span><span style="color: #000000;"> std; </span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> n, d, now, last; </span><span style="color: #008080;"> 6</span> <span style="color: #000000;">ll ans; </span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> main() </span><span style="color: #008080;"> 8</span> <span style="color: #000000;">{ </span><span style="color: #008080;"> 9</span> ios::sync_with_stdio(<span style="color: #0000ff;">false</span><span style="color: #000000;">); </span><span style="color: #008080;">10</span> <span style="color: #0000ff;">while</span>(cin&gt;&gt;n&gt;&gt;d&gt;&gt;<span style="color: #000000;">last) </span><span style="color: #008080;">11</span> <span style="color: #000000;"> { </span><span style="color: #008080;">12</span> ans = <span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">13</span> <span style="color: #0000ff;">for</span> (<span style="color: #0000ff;">int</span> i = <span style="color: #800080;">2</span>; i &lt;= n; i++<span style="color: #000000;">) </span><span style="color: #008080;">14</span> <span style="color: #000000;"> { </span><span style="color: #008080;">15</span> cin&gt;&gt;<span style="color: #000000;">now; </span><span style="color: #008080;">16</span> <span style="color: #0000ff;">int</span> k = (now - last) %<span style="color: #000000;"> d; </span><span style="color: #008080;">17</span> ans += min(abs(k), min(abs(k - d), abs(k +<span style="color: #000000;"> d))); </span><span style="color: #008080;">18</span> last =<span style="color: #000000;"> now; </span><span style="color: #008080;">19</span> <span style="color: #000000;"> } </span><span style="color: #008080;">20</span> cout &lt;&lt; ans &lt;&lt;<span style="color: #000000;"> endl; </span><span style="color: #008080;">21</span> <span style="color: #000000;"> } </span><span style="color: #008080;">22</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">23</span> }</pre> </div> <span class="cnblogs_code_collapse">View Code</span> </div> <p>&nbsp;</p> <p>&nbsp;</p> <h1>第二题:</h1> <h2>&nbsp;题目链接:<span style="text-decoration: underline;"><span style="color: #ff0000;"><a href="https://ac.nowcoder.com/acm/contest/934/B" target="_blank"><span style="color: #ff0000; text-decoration: underline;">https://ac.nowcoder.com/acm/contest/934/B</span></a></span></span></h2> <p><span style="font-size: 18px;">这道题的解法是莫比乌斯反演,因为这个算法我也才刚开始学,所以打的过程中出了很多问题</span></p> <p><span style="font-size: 18px;"><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mopen mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace newline"><span class="base"><span class="strut"><span class="mord"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mbin"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml">然后就是题目本身的数据好像也有点问题,很多正解的代码提交也是tle,不过听说赛后重测了</span><br></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <p><span style="font-size: 18px;"><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mopen mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace newline"><span class="base"><span class="strut"><span class="mord"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mbin"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml">(我的分数本来是170,排在59,但后来分数没变排名却成了55(滑稽...滑稽))</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <p><span style="font-size: 18px;"><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mopen mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace newline"><span class="base"><span class="strut"><span class="mord"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mbin"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml">下面是作者给的题解</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <p><span style="font-size: 18px;"><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mopen mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace newline"><span class="base"><span class="strut"><span class="mord"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mbin"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151272_91A4A0E99C43F1199FD20A2E19A1B2A4"></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <p>&nbsp;</p> <p><span style="font-size: 18px;"><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace mtight"><span class="mop mtight"><span class="mop op-symbol small-op mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mord mathdefault mtight"><span class="mopen mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size3 size1 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mathdefault mtight"><span class="mbin mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace newline"><span class="base"><span class="strut"><span class="mord"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mbin"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex"><span class="katex-mathml">贴下我的代码</span><span style="color: #ff0000;">tle</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <div class="cnblogs_code" onclick="cnblogs_code_show('0d97d53b-df99-40f1-b86e-56f6187a1fd0')"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151285_BEE14B9FE62E4101C719260C64AA4C83"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151304_BE319C0086E6D58007898F5FCE19C980"> <div id="cnblogs_code_open_0d97d53b-df99-40f1-b86e-56f6187a1fd0" class="cnblogs_code_hide"> <pre><span style="color: #008080;"> 1</span> #include&lt;bits/stdc++.h&gt; <span style="color: #008080;"> 2</span> <span style="color: #0000ff;">using</span> <span style="color: #0000ff;">namespace</span><span style="color: #000000;"> std; </span><span style="color: #008080;"> 3</span> <span style="color: #0000ff;">const</span> <span style="color: #0000ff;">int</span> N=<span style="color: #800080;">1000010</span><span style="color: #000000;">; </span><span style="color: #008080;"> 4</span> <span style="color: #0000ff;">const</span> <span style="color: #0000ff;">int</span> mod=<span style="color: #800080;">998244353</span><span style="color: #000000;">; </span><span style="color: #008080;"> 5</span> <span style="color: #0000ff;">int</span> vis[N],p[N],phi[N],num[N],cnt,ans=<span style="color: #800080;">1</span><span style="color: #000000;">,K; </span><span style="color: #008080;"> 6</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> fac[N],rev[N],Mn[N],P[N]; </span><span style="color: #008080;"> 7</span> vector&lt;<span style="color: #0000ff;">int</span>&gt;<span style="color: #000000;">G[N]; </span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">int</span> pow_mod(<span style="color: #0000ff;">int</span> a,<span style="color: #0000ff;">int</span><span style="color: #000000;"> x) </span><span style="color: #008080;"> 9</span> <span style="color: #000000;">{ </span><span style="color: #008080;">10</span> <span style="color: #0000ff;">int</span> res=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">11</span> <span style="color: #0000ff;">while</span><span style="color: #000000;">(x) </span><span style="color: #008080;">12</span> <span style="color: #000000;"> { </span><span style="color: #008080;">13</span> <span style="color: #0000ff;">if</span>(x&amp;<span style="color: #800080;">1</span>) res=1LL*res*a%<span style="color: #000000;">mod; </span><span style="color: #008080;">14</span> x&gt;&gt;=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">15</span> a=1LL*a*a%<span style="color: #000000;">mod; </span><span style="color: #008080;">16</span> <span style="color: #000000;"> } </span><span style="color: #008080;">17</span> <span style="color: #0000ff;">return</span><span style="color: #000000;"> res; </span><span style="color: #008080;">18</span> <span style="color: #000000;">} </span><span style="color: #008080;">19</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> init() </span><span style="color: #008080;">20</span> <span style="color: #000000;">{ </span><span style="color: #008080;">21</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=<span style="color: #800080;">2</span>; i&lt;N; i++<span style="color: #000000;">) </span><span style="color: #008080;">22</span> <span style="color: #000000;"> { </span><span style="color: #008080;">23</span> <span style="color: #0000ff;">if</span>(!vis[i]) p[++cnt]=i,Mn[i]=mod,P[i]=<span style="color: #000000;">i; </span><span style="color: #008080;">24</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> j=<span style="color: #800080;">1</span>; j&lt;=cnt&amp;&amp;i*p[j]&lt;N; j++<span style="color: #000000;">) </span><span style="color: #008080;">25</span> <span style="color: #000000;"> { </span><span style="color: #008080;">26</span> vis[i*p[j]]=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">27</span> P[i*p[j]]=<span style="color: #000000;">p[j]; </span><span style="color: #008080;">28</span> <span style="color: #0000ff;">if</span>(!(i%p[j])) <span style="color: #0000ff;">break</span><span style="color: #000000;">; </span><span style="color: #008080;">29</span> <span style="color: #000000;"> } </span><span style="color: #008080;">30</span> <span style="color: #000000;"> } </span><span style="color: #008080;">31</span> <span style="color: #000000;">} </span><span style="color: #008080;">32</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> main() </span><span style="color: #008080;">33</span> <span style="color: #000000;">{ </span><span style="color: #008080;">34</span> ios::sync_with_stdio(<span style="color: #0000ff;">false</span><span style="color: #000000;">); </span><span style="color: #008080;">35</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> n,Q,x; </span><span style="color: #008080;">36</span> <span style="color: #000000;"> init(); </span><span style="color: #008080;">37</span> cin&gt;&gt;<span style="color: #000000;">n; </span><span style="color: #008080;">38</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=<span style="color: #800080;">1</span>; i&lt;=n; i++<span style="color: #000000;">) </span><span style="color: #008080;">39</span> <span style="color: #000000;"> { </span><span style="color: #008080;">40</span> cin&gt;&gt;<span style="color: #000000;">x; </span><span style="color: #008080;">41</span> <span style="color: #0000ff;">while</span>(x&gt;<span style="color: #800080;">1</span><span style="color: #000000;">) </span><span style="color: #008080;">42</span> <span style="color: #000000;"> { </span><span style="color: #008080;">43</span> <span style="color: #0000ff;">int</span> t=P[x],res=<span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">44</span> <span style="color: #0000ff;">while</span>(x%t==<span style="color: #800080;">0</span>) x/=t,res++<span style="color: #000000;">; </span><span style="color: #008080;">45</span> <span style="color: #000000;"> G[t].push_back(res); </span><span style="color: #008080;">46</span> <span style="color: #000000;"> } </span><span style="color: #008080;">47</span> <span style="color: #000000;"> } </span><span style="color: #008080;">48</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i = <span style="color: #800080;">1</span>; i&lt;=cnt; i++<span style="color: #000000;">) </span><span style="color: #008080;">49</span> <span style="color: #000000;"> { </span><span style="color: #008080;">50</span> <span style="color: #0000ff;">if</span>(G[p[i]].size()==<span style="color: #800080;">0</span>) <span style="color: #0000ff;">continue</span><span style="color: #000000;">; </span><span style="color: #008080;">51</span> <span style="color: #000000;"> sort(G[p[i]].begin(),G[p[i]].end()); </span><span style="color: #008080;">52</span> <span style="color: #0000ff;">int</span> res=<span style="color: #800080;">0</span>,sum=<span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">53</span> res=G[p[i]][<span style="color: #800080;">0</span><span style="color: #000000;">]; </span><span style="color: #008080;">54</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> j=<span style="color: #800080;">1</span>; j&lt;G[p[i]].size(); j++) sum+=res,res+=<span style="color: #000000;">G[p[i]][j]; </span><span style="color: #008080;">55</span> ans=1LL*ans*pow_mod(p[i],sum)%<span style="color: #000000;">mod; </span><span style="color: #008080;">56</span> <span style="color: #000000;"> } </span><span style="color: #008080;">57</span> cout&lt;&lt;ans&lt;&lt;<span style="color: #000000;">endl; </span><span style="color: #008080;">58</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">59</span> }</pre> </div> <span class="cnblogs_code_collapse">View Code</span> </div> <p><span style="font-size: 18px;">贴下大佬<span style="color: #00ff00;">accept</span>的代码</span></p> <div class="cnblogs_code" onclick="cnblogs_code_show('b06f0b20-a280-4d33-9a9e-8f77dd8f2742')"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151326_BEE14B9FE62E4101C719260C64AA4C83"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151347_BE319C0086E6D58007898F5FCE19C980"> <div id="cnblogs_code_open_b06f0b20-a280-4d33-9a9e-8f77dd8f2742" class="cnblogs_code_hide"> <pre><span style="color: #008080;"> 1</span> #include&lt;bits/stdc++.h&gt; <span style="color: #008080;"> 2</span> <span style="color: #0000ff;">using</span> <span style="color: #0000ff;">namespace</span><span style="color: #000000;"> std; </span><span style="color: #008080;"> 3</span> <span style="color: #0000ff;">#define</span> LL long long <span style="color: #008080;"> 4</span> <span style="color: #0000ff;">#define</span> M 1000005 <span style="color: #008080;"> 5</span> <span style="color: #0000ff;">#define</span> inf 0x3f3f3f3f <span style="color: #008080;"> 6</span> <span style="color: #0000ff;">const</span> <span style="color: #0000ff;">int</span> Mod=<span style="color: #800080;">998244353</span><span style="color: #000000;">; </span><span style="color: #008080;"> 7</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> n; </span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> Max,A[M]; </span><span style="color: #008080;"> 9</span> <span style="color: #0000ff;">int</span> Ans=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">10</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> Cnt[M]; </span><span style="color: #008080;">11</span> <span style="color: #000000;">LL f[M]; </span><span style="color: #008080;">12</span> <span style="color: #0000ff;">int</span> R_P(<span style="color: #0000ff;">int</span><span style="color: #000000;"> x,LL y) { </span><span style="color: #008080;">13</span> <span style="color: #0000ff;">int</span> res=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">14</span> <span style="color: #0000ff;">while</span><span style="color: #000000;">(y) { </span><span style="color: #008080;">15</span> <span style="color: #0000ff;">if</span>(y&amp;<span style="color: #800080;">1</span>)res=1LL*res*x%<span style="color: #000000;">Mod; </span><span style="color: #008080;">16</span> x=1LL*x*x%Mod,y&gt;&gt;=<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">17</span> <span style="color: #000000;"> } </span><span style="color: #008080;">18</span> <span style="color: #0000ff;">return</span><span style="color: #000000;"> res; </span><span style="color: #008080;">19</span> <span style="color: #000000;">} </span><span style="color: #008080;">20</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> main() { </span><span style="color: #008080;">21</span> scanf(<span style="color: #800000;">"</span><span style="color: #800000;">%d</span><span style="color: #800000;">"</span>,&amp;<span style="color: #000000;">n); </span><span style="color: #008080;">22</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=<span style="color: #800080;">1</span>; i&lt;=n; ++<span style="color: #000000;">i) </span><span style="color: #008080;">23</span> scanf(<span style="color: #800000;">"</span><span style="color: #800000;">%d</span><span style="color: #800000;">"</span>,A+i),Max=max(A[i],Max),++<span style="color: #000000;">Cnt[A[i]]; </span><span style="color: #008080;">24</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=Max; i&gt;<span style="color: #800080;">1</span>; --<span style="color: #000000;">i) { </span><span style="color: #008080;">25</span> <span style="color: #0000ff;">int</span> res=<span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">26</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> j=i; j&lt;=Max; j+=i)res+=<span style="color: #000000;">Cnt[j]; </span><span style="color: #008080;">27</span> <span style="color: #0000ff;">if</span>(res&gt;<span style="color: #800080;">1</span><span style="color: #000000;">) { </span><span style="color: #008080;">28</span> f[i]=1LL*res*(res-<span style="color: #800080;">1</span>)&gt;&gt;<span style="color: #800080;">1</span><span style="color: #000000;">; </span><span style="color: #008080;">29</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> j=i+i; j&lt;=Max; j+=i)f[i]-=<span style="color: #000000;">f[j]; </span><span style="color: #008080;">30</span> Ans=1LL*Ans*R_P(i,f[i])%<span style="color: #000000;">Mod; </span><span style="color: #008080;">31</span> <span style="color: #000000;"> } </span><span style="color: #008080;">32</span> <span style="color: #000000;"> } </span><span style="color: #008080;">33</span> printf(<span style="color: #800000;">"</span><span style="color: #800000;">%d</span><span style="color: #800000;">"</span><span style="color: #000000;">,Ans); </span><span style="color: #008080;">34</span> }</pre> </div> <span class="cnblogs_code_collapse">View Code</span> </div> <p>&nbsp;</p> <p>&nbsp;</p> <p><span style="font-size: 14pt;"><strong><span class="katex"><span class="katex-html"><span class="base"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mspace"><span 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class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span 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mtight"><span class="mord mathdefault mtight"><span class="mclose mtight"><span class="katex"><span class="katex-mathml"><span class="katex-html"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mopen"><span class="mord mathdefault"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mtight"><span class="mord mathdefault mtight"><span class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mspace"><span class="mop"><span class="mop op-symbol small-op"><span class="msupsub"><span 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class="mrel mtight"><span class="mord mtight"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mopen"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mord mathdefault"><span class="mopen"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mpunct"><span class="mspace"><span class="mord"><span class="mord mathdefault"><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist"><span class="pstrut"><span class="sizing reset-size6 size3 mtight"><span class="mord mathdefault mtight"><span class="vlist-s"><span class="vlist-r"><span class="vlist"><span class="mclose"><span class="mspace"><span class="mrel"><span class="mspace"><span class="base"><span class="strut"><span class="mord mathdefault"><span class="mclose"><span class="katex-mathml">ps:第三题题目有点恶心就直接暴力拿了20分走人</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></strong></span></p> <p>&nbsp;</p> <p>&nbsp;</p> <p>&nbsp;</p> <h1>————<strong>普及组</strong>————</h1> <p>&nbsp;</p> <h1>第一题:手术等级???</h1> <h2>题目链接:<a href="https://ac.nowcoder.com/acm/contest/929/A" target="_blank"><span style="text-decoration: underline;"><span style="color: #ff0000; text-decoration: underline;">https://ac.nowcoder.com/acm/contest/929/A</span></span></a></h2> <p><span style="font-size: 18px;">个人感觉挺经典的一道题。。。</span></p> <p><span style="font-size: 18px;">a[ N ] 存题目给定的数组,sum[ N ] 存 a[ i ] * i的前缀和,sum_[ N ] 存 a[ i ]的前缀和</span><span style="font-size: 18px;">那么假</span><span style="font-size: 18px;">设我们</span></p> <p><span style="font-size: 18px;">要切</span><span style="font-size: 18px;">的位置为k和k+1之间,那么切开后的区间为 1......k 和 k......n,那么此时的完美度可以这么表示:</span></p> <p><span style="font-size: 18px; color: #ff9900;"><strong>wmd = a[1]*1+a[2]*2+...+a[k]*k &nbsp; &nbsp; + &nbsp; &nbsp;a[i]*(i - k) + a[i+1]*(i+1-k)+...+a[n]*[n-k]</strong>&nbsp;</span><span style="font-size: 18px; color: #000000;">,</span><span style="font-size: 18px;">对于后半部分我们可</span></p> <p><span style="font-size: 18px;">以发现 <span style="color: #ff9900;"><strong>a[ i ]*(i - k)</strong> 可以分解为 <strong>a[ i ]*i - a[ i ]*k</strong>&nbsp;<span style="color: #000000;">,</span></span></span><span style="font-size: 18px;">所以最后的 wmd 可以表示为下面的式子:</span></p> <p><span style="font-size: 18px;"><span style="background-color: #ffffff; color: #ff00ff;"><strong>wmd = a[ 1 ] * 1 + a[ 2 ] * 2 + ... + a[ k ] * k + ... + a[ n ] * n - k*( a[ k+1] + ... + a[ n ]) &nbsp; = sum[ n ] - k * (sum_[ n ] - sum[ n-k ])</strong></span>;</span></p> <p><span style="font-size: 18px;">贴下代码:</span></p> <div class="cnblogs_code" onclick="cnblogs_code_show('cff8df56-ece8-4aeb-acd1-2f1cd030c4e6')"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151357_BEE14B9FE62E4101C719260C64AA4C83"> <img src="https://uploadfiles.nowcoder.com/images/20191127/552689300_1574850151367_BE319C0086E6D58007898F5FCE19C980"> <div id="cnblogs_code_open_cff8df56-ece8-4aeb-acd1-2f1cd030c4e6" class="cnblogs_code_hide"> <pre><span style="color: #008080;"> 1</span> #include&lt;bits/stdc++.h&gt; <span style="color: #008080;"> 2</span> <span style="color: #0000ff;">using</span> <span style="color: #0000ff;">namespace</span><span style="color: #000000;"> std; </span><span style="color: #008080;"> 3</span> <span style="color: #0000ff;">#define</span> ll long long <span style="color: #008080;"> 4</span> <span style="color: #0000ff;">#define</span> inf 0x3f3f3f3f3f3f3f <span style="color: #008080;"> 5</span> template&lt;<span style="color: #0000ff;">class</span> T&gt; <span style="color: #0000ff;">void</span> read(T &amp;<span style="color: #000000;">x) </span><span style="color: #008080;"> 6</span> <span style="color: #000000;">{ </span><span style="color: #008080;"> 7</span> x=<span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;"> 8</span> <span style="color: #0000ff;">char</span> ch=<span style="color: #000000;">getchar(); </span><span style="color: #008080;"> 9</span> <span style="color: #0000ff;">while</span>(!isdigit(ch))ch=<span style="color: #000000;">getchar(); </span><span style="color: #008080;">10</span> <span style="color: #0000ff;">while</span>(isdigit(ch))x=x*<span style="color: #800080;">10</span>+ch-<span style="color: #800000;">'</span><span style="color: #800000;">0</span><span style="color: #800000;">'</span>,ch=<span style="color: #000000;">getchar(); </span><span style="color: #008080;">11</span> <span style="color: #000000;">} </span><span style="color: #008080;">12</span> <span style="color: #0000ff;">const</span> <span style="color: #0000ff;">int</span> N = 1e5+<span style="color: #800080;">10</span><span style="color: #000000;">; </span><span style="color: #008080;">13</span> <span style="color: #000000;">ll a[N],sum[N],sum_[N]; </span><span style="color: #008080;">14</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> main() </span><span style="color: #008080;">15</span> <span style="color: #000000;">{ </span><span style="color: #008080;">16</span> ios::sync_with_stdio(<span style="color: #0000ff;">false</span><span style="color: #000000;">); </span><span style="color: #008080;">17</span> <span style="color: #0000ff;">int</span><span style="color: #000000;"> n; </span><span style="color: #008080;">18</span> <span style="color: #0000ff;">while</span>(cin&gt;&gt;<span style="color: #000000;">n) </span><span style="color: #008080;">19</span> <span style="color: #000000;"> { </span><span style="color: #008080;">20</span> cin&gt;&gt;a[<span style="color: #800080;">1</span><span style="color: #000000;">]; </span><span style="color: #008080;">21</span> sum[<span style="color: #800080;">1</span>] = a[<span style="color: #800080;">1</span><span style="color: #000000;">]; </span><span style="color: #008080;">22</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> i=<span style="color: #800080;">2</span>;i&lt;=n;i++<span style="color: #000000;">) </span><span style="color: #008080;">23</span> <span style="color: #000000;"> { </span><span style="color: #008080;">24</span> cin&gt;&gt;<span style="color: #000000;">a[i]; </span><span style="color: #008080;">25</span> sum[i] = sum[i-<span style="color: #800080;">1</span>] + a[i] *<span style="color: #000000;"> i; </span><span style="color: #008080;">26</span> <span style="color: #000000;"> } </span><span style="color: #008080;">27</span> partial_sum(a+<span style="color: #800080;">1</span>,a+<span style="color: #800080;">1</span>+n,sum_+<span style="color: #800080;">1</span><span style="color: #000000;">); </span><span style="color: #008080;">28</span> ll ans =<span style="color: #000000;"> inf; </span><span style="color: #008080;">29</span> <span style="color: #008000;">//</span><span style="color: #008000;"> a[1]*1 + a[2]*2 + a[3]*3 + a[4]*4 + a[5]*5; </span><span style="color: #008080;">30</span> <span style="color: #008000;">//</span><span style="color: #008000;"> -3*(a[4] + a[5]);</span> <span style="color: #008080;">31</span> <span style="color: #0000ff;">for</span>(<span style="color: #0000ff;">int</span> k=<span style="color: #800080;">0</span>;k&lt;=n;k++<span style="color: #000000;">) </span><span style="color: #008080;">32</span> <span style="color: #000000;"> { </span><span style="color: #008080;">33</span> ans = min(ans,sum[n] - k*(sum_[n] -<span style="color: #000000;"> sum_[k])); </span><span style="color: #008080;">34</span> <span style="color: #000000;"> } </span><span style="color: #008080;">35</span> cout&lt;&lt;ans&lt;&lt;<span style="color: #000000;">endl; </span><span style="color: #008080;">36</span> <span style="color: #008000;">//</span><span style="color: #008000;">cout&lt;&lt;inf&lt;&lt;endl;</span> <span style="color: #008080;">37</span> <span style="color: #000000;"> } </span><span style="color: #008080;">38</span> <span style="color: #0000ff;">return</span> <span style="color: #800080;">0</span><span style="color: #000000;">; </span><span style="color: #008080;">39</span> }</pre> </div> <span class="cnblogs_code_collapse">View Code</span> </div> <p>&nbsp;</p> <p><span style="font-size: 14pt;"><strong>因为打完提高组已经没多少时间了,所以我普及组就做了一题,剩下的题目留给以后慢慢</strong></span></p>