https://leetcode.com/problems/longest-consecutive-sequence/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int longestConsecutive(vector<int>& nums) { int ans = 0;

https://leetcode.com/problems/happy-number/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: int getNext(int n) { int res = 0; string str = to_string(

https://leetcode.com/problems/group-anagrams/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: vector<vector<string>> groupAnagrams(vector<string&

https://leetcode.com/problems/word-pattern/description/?envType=study-plan-v2&envId=top-interview-150 class Solution { public: bool wordPattern(string pattern, string s) { unordered_map<char, string&