LeetCode LeetCode problems solutions # Title Solution 1 Two Sum Javascript 2 Add Two Numbers Javascript 3 Longest Substring Without Repeating Characters Javascript 4 Median of Two Sorted Arrays Javascript 14 Longest Common Prefix Javascript 20 Valid Parentheses Javascript 21 Merge Two Sorted Lists Javascript 23 Merge k Sorted Lists Javascript 28 Find the Index of the First Occurrence in a String Javascript 50 Pow(x, n) Javascript 101 Symmetric Tree Javascript 121 Best Time to Buy and Sell Stock Javascript 129 Sum Root to Leaf Numbers Javascript 142 Linked List Cycle II Javascript 205 Isomorphic Strings Javascript 206 Reverse Linked List Javascript 392 Is Subsequence Javascript 409 Longest Palindrome Javascript 724 Find Pivot Index Javascript 876 Middle of the Linked List Javascript 958 Check Completeness of a Binary Tree Javascript 1480 Running Sum of 1d Array Javascript 1539 Kth Missing Positive Number Javascript 2177 Find Three Consecutive Integers That Sum to a Given Number Javascript 2348 Number of Zero-Filled Subarrays Javascript 2444 Count Subarrays With Fixed Bounds Javascript