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全部文章（共262篇）

小乐乐与二段数（打表，剪枝）

二段数对于形如xxx这种数，可以由x*111表示，这对表示二段数及判断二段数是否是n的倍数有很大的帮助（详见官方题解）一开始考虑枚举n的倍数，再判断是否是二段数，超时（比如170: 11111111111111110，后面是前面的65,359,477,124,183倍，不超时才怪）后来感觉二段数数目...

枚举剪枝数学

2019-11-10

22 1769

Random Point in Triangle(期望/随机数猜结论）

链接：https://ac.nowcoder.com/acm/contest/881/F 来源：牛客网题目描述 Bobo has a triangle ABC with A(x1,y1),B(x2,y2)and C(x3,y3). Picking a point P uniformly i...

2019-07-19

0 1016

Integration（定积分）

链接：https://ac.nowcoder.com/acm/contest/881/B 来源：牛客网裂项，化乘为加以此类推 #include<iostream> #include<cstdio> #include<algorithm&...

2019-07-19

0 1010

Equivalent Prefixes（单调栈）

链接：https://ac.nowcoder.com/acm/contest/881/A 来源：牛客网题目描述 Two arrays u and v each with m distinct elements are called equivalent if and only if RMQ...

2019-07-19

0 808

ABBA（组合数学/dp）

链接：https://ac.nowcoder.com/acm/contest/881/E 来源：牛客网 Bobo has a string of length 2(n + m) which consists of characters `A` and `B`. The string also ...

2019-07-19

1 1352

rRiKqXHHsB

2019-07-18

0 545

Easy Game（博弈dp,区间dp）

https://cn.vjudge.net/problem/LightOJ-1031 You are playing a two player game. Initially there are n integer numbers in an array and player A and B ge...

2019-07-18

0 1056

String painter（区间dp，好题难题）

https://cn.vjudge.net/problem/HDU-2476 There are two strings A and B with equal length. Both strings are made up of lower case letters. Now you have ...

2019-07-18

0 939

Brackets（括号匹配，区间dp）

https://cn.vjudge.net/problem/POJ-2955 We give the following inductive definition of a “regular brackets” sequence: the empty sequence is a regula...

2019-07-17

0 824

Queries for Number of Palindromes（回文串，dp，好题）

https://cn.vjudge.net/problem/CodeForces-245H You've got a string s = s1s2... s|s| of length |s|, consisting of lowercase English letters. There also...

2019-07-17

0 588