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题解 | #求1+2+3+...+n# 10-29 NO 9

class Solution { public: int Sum_Solution(int n) { int sum = 0; while(n >= 0) { sum += (n--); } ...

C++

2021-10-29

0 291

题解 | #把数组排成最小的数# 10-29 NO 8 熟练使用cmp

class Solution { public: static bool cmp(string &a, string &b) { return a + b < b + a; } string PrintMinNumber(vector&l...

C++

2021-10-29

1 299

题解 | #字符串的排列# 10-29 NO 7 使用set去重是很聪明的想法

class Solution { public: set<string>ret; void dfs(string str, int s) { if (s == str.size() - 1) { ret.insert(str); ...

C++

2021-10-29

0 294

题解 | #斐波那契数列# 10-29 NO 6 凑次数

class Solution { public: int Fibonacci(int n) { if(n == 1 || n == 2) { return 1; } vector<int> dp(n + 1)...

C++

2021-10-29

0 268

题解 | #二叉树的下一个结点# 10-29 NO 5 画图+分析+读题

/* struct TreeLinkNode { int val; struct TreeLinkNode *left; struct TreeLinkNode *right; struct TreeLinkNode *next; TreeLinkNode(i...

C++

2021-10-29

0 408

题解 | #从上往下打印二叉树# 10-29 NO 4 层次遍历

/* struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ /* ...

C++

2021-10-29

0 314

题解 | #二叉树中和为某一值的路径# 10-29 NO 3 （还是要自己尝试一下）

/* struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ /* ...

C++

2021-10-29

0 366

题解 | #树的子结构#10-29 NO 2

/* struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ class ...

C++

2021-10-29

0 392

题解 | #二叉树的深度# 10-29- N01

/* struct TreeNode { int val; struct TreeNode *left; struct TreeNode *right; TreeNode(int x) : val(x), left(NULL), right(NULL) { } };*/ class ...

C++

2021-10-29

0 305

题解 | #删除有序链表中重复的元素-II# 做题目要有自己的思路

/** * struct ListNode { * int val; * struct ListNode *next; * }; */ /* 1，哨兵节点 2，设置curr指向head，prev指向哨兵节点 3，while(curr && curr->next) { ...

C++

2021-10-28

0 293