https://leetcode.com/problems/smallest-substring-with-identical-characters-i/description/ Tag: Binary Search Hard: 2301 class Solution { public: bool isValid(string &s, int target, int numOps) { int n

https://leetcode.com/problems/minimize-the-maximum-edge-weight-of-graph/description/ Tag: Binary Search, DFS class Solution { public: void dfs(int pre, int cur, vector<vector<pair<

https://leetcode.com/problems/longest-special-path/description/ class Solution { public: int ansValue, ansLen; void dfs(int pre, int cur, int curDep, vector<vector<pair&

https://leetcode.com/problems/paint-house-iv/description/ Tag: DP typedef long long ll; class Solution { public: long long minCost(int n, vector<vector<int&