I've joined the #100DaysOfCode Challenge for Leetcode My leetcode profile can be viewed here Contents Rules FAQ Resources 100 Days Of leetcode - Log Day Problem 1 Top K Frequent Elements 2 Add Two Numbers 3 Longest Substring Without Repeating Characters 4 Median of Two Sorted Arrays 5 Longest Palindromic Substring 6 Merge Sorted Array 7 Remove Nth Node From End of List 8 Valid Number 9 String to Integer (atoi) 10 Two Sum 11 Reverse Integer 12 Valid Parentheses 13 3sum 14 Minimum Add to Make Parentheses Valid 15 Word Subsets 16 Merge Intervals 17 Permutations 18 Remove Duplicates from Sorted Array