- 217. Contains Duplicate (Arrays)
- 268. Missing Number (Arrays, Bit Manipulation)
- 448. Find All Numbers Disappeared in an Array (Arrays)
- 136. Single Number (Arrays, Bit Manipulation)
- 70. Climbing Stairs (Math, Dynamic Programming, Memoization)
- 704. Binary Search (Arrays, Binary Search)
- 912. Sort An Array
- Count Pairs With Given Sum
- 121. Best Time to Buy and Sell Stock
- 53. Maximum Subarray