- 1. Two Sum
- 217. Contains Duplicate
- 242. Valid Anagram
- 125. Valid Palindrome
- 20. Valid Parentheses
- 704. Binary Search
- 121. Best Time to Buy and Sell Stock
- 206. Reverse Linked List
- 21. Merge Two Sorted Lists
- 141. Linked List Cycle
- 49. Group Anagrams
- 347. Top K Frequent Elements
- 238. Product of Array Except Self
- 36. Valid Sudoku
- 128. Longest Consecutive Sequence
- 167. Two Sum II
- 15. 3Sum
- 11. Container With Most Water
- 155. Min Stack
- 150. Evaluate Reverse Polish Notation
- 74. Search a 2D Matrix
- 22. Generate Parentheses
- 739. Daily Temperatures
- 853. Car Fleet
- 875. Koko Eating Bananas
- 153. Find Minimum in Rotated Sorted Array
- 33. Search in Rotated Sorted Array
- 981. Time Based Key
- 3. Longest Substring Without Repeating Characters
- 143. Reorder List
- 424. Longest Repeating Character Replacement
- 19. Remove Nth Node From End of List
- 138. Copy List with Random Pointer
- 2. Add Two Numbers
- 567. Permutation in String
- 287. Find the Duplicate Number