https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int strStr(string haystack, string needle) { int m = haystack.size(), n

https://leetcode.com/problems/reverse-words-in-a-string/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: string reverseWords(string s) { int n = s.size(); for (int i = 0;

https://leetcode.com/problems/roman-to-integer/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int romanToInt(string s) { int n = s.size(); int ans = 0;

https://leetcode.com/problems/trapping-rain-water/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int trap(vector<int>& height) { int n = height.size(