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LeetCode - Problems - Algorithms - 202. Happy Number LeetCode - The World's Leading Online Programming Learning Platform Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. leetcode.com My Solution (C#) static public bool IsHappy(int n) { List tracks = new List(); while (!tracks.Contains(n)) { tracks.Add(n)..

LeetCode - Problems - Algorithms - 100. Valid Palindrome Valid Palindrome - LeetCode Can you solve this real interview question? Valid Palindrome - A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric cha leetcode.com My Solution (C#) public class Solution { pu..