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• Tried to use optimal solutions as much as I can. Most solutions are from the LeetCode community.
• Written inAirbnb JavaScript style.
• A work in progress.
• If you find something wrong or the complexity is not good, you are very welcome to contribute your better solutions.

• 7. Reverse Integer -Solution
• 8. String to Integer (atoi) -Solution
• 9. Palindrome Number -Solution
• 14. Longest Common Prefix -Solution
• 19. Remove Nth Node From End of List -Solution
• 21. Merge Two Sorted Lists -Solution
• 24. Swap Nodes in Pairs -Solution
• 28. Implement strStr() -Solution
• 38. Count and Say -Solution
• 66. Plus One -Solution
• 67. Add Binary -Solution
• 70. Climbing Stairs -Solution
• 83. Remove Duplicates from Sorted List -Solution
• 88. Merge Sorted Array -Solution
• 100. Same Tree -Solution
• 101. Symmetric Tree -Solution
• 102. Binary Tree Level Order Traversal -Solution
• 104. Maximum Depth of Binary Tree -Solution
• 110. Balanced Binary Tree -Solution
• 111. Minimum Depth of Binary Tree -Solution
• 112. Path Sum -Solution
• 118. Pascal's Triangle -Solution
• 119. Pascal's Triangle II -Solution
• 125. Valid Palindrome -Solution
• 160. Intersection of Two Linked Lists -Solution
• 165. Compare Version Numbers -Solution
• 169. Majority Element -Solution
• 172. Factorial Trailing Zeroes -Solution
• 190. Reverse Bits -Solution
• 191. Number of 1 Bits -Solution
• 198. House Robber -Solution
• 202. Happy Number -Solution
• 203. Remove Linked List Elements -Solution
• 204. Count Primes -Solution
• 205. Isomorphic Strings -Solution
• 206. Reverse Linked List -Solution
• 217. Contains Duplicate -Solution
• 219. Contains Duplicate II -Solution
• 223. Rectangle Area -Solution
• 225. Implement Stack using Queues -Solution
• 226. Invert Binary Tree -Solution
• 228. Summary Ranges -Solution
• 231. Power of Two -Solution
• 232. Implement Queue using Stacks -Solution
• 234. Palindrome Linked List -Solution
• 235. Lowest Common Ancestor of a Binary Search Tree -Solution
• 237. Delete Node in a Linked List -Solution
• 242. Valid Anagram -Solution
• 258. Add Digits -Solution
• 263. Ugly Number -Solution
• 278. First Bad Version -Solution
• 283. Move Zeroes -Solution
• 290. Word Pattern -Solution
• 299. Bulls and Cows -Solution
• 303. Range Sum Query - Immutable -Solution
• 328. Odd Even Linked List -Solution

• 3. Longest Substring Without Repeating Characters -Solution
• 22. Generate Parentheses -Solution
• 24. Swap Nodes in Pairs -Solution
• 35. Search Insert Position Characters -Solution
• 39. Combination Sum -Solution
• 46. Permutations -Solution
• 53. Maximum Subarray -Solution
• 54. Spiral Matrix -Solution
• 59. Spiral Matrix II -Solution
• 62.Unique Paths -Solution
• 64.Minimum Path Sum -Solution
• 75. Sort Colors -Solution
• 77.Combinations -Solution
• 94. Binary Tree Inorder Traversal -Solution
• 96. Unique Binary Search Trees -Solution
• 108. Convert Sorted Array to Binary Search Tree -Solution
• 116. Populating Next Right Pointers in Each Node -Solution
• 121. Best Time to Buy and Sell Stock -Solution
• 122. Best Time to Buy and Sell Stock II -Solution
• 136. Single Number -Solution
• 141. Linked List Cycle -Solution
• 144. Binary Tree Preorder Traversal -Solution
• 153.Find Minimum in Rotated Sorted Array -Solution
• 230. Kth Smallest Element in a BST -Solution
• 238. Product of Array Except Self -Solution
• 260. Single Number III -Solution
• 268. Missing Number -Solution
• 318. Maximum Product of Word Lengths -Solution
• 319. Bulb Switcher -Solution