- Find Second Largest Number
- Missing Number
- Number of Good Pairs
- Union of two arrays
- Decreasing Sequence
- Majority Element
- longest common prefix
- rotate string
- Love Story
- Valid Anagram
- New Palindrome
- Jump Game II
- Remove Outermost Parentheses
- Short Sort
- Digit Minimization
- Minimum Time to Make Rope Colorful
- Fractional Knapsack
- Desorting
- Quick Sort
- XOR = Average