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(

https://leetcode.com/problems/candy/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int candy(vector<int>& ratings) { int n = ratings.

https://leetcode.com/problems/gas-station/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int canCompleteCircuit(vector<int>& gas, vector<int>

https://leetcode.com/problems/product-of-array-except-self/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: vector<int> productExceptSelf(vector<int>& nums)