- Valid Anagram
- Group Anagrams
- Find Common Characters
- Two Sum
- Valid Sudoku
- Longest Consecutive Sequence
- Hand of Straights
- Find the Maximum Number of Elements in Subset
- Contains Duplicate
- Contains Duplicate II
- 4Sum II
- Max Points on a Line
- Word Pattern
- Isomorphic Strings
- Intersection of Two Arrays
- Happy Number
- Ransom Note
- Minimum Rounds to Complete All Tasks
- Majority Element II
- Time Based Key-Value Store
- Find Subarrays With Equal Sum
- Two Sum IV - Input is a BST
- Roman to Integer
- Integer to Roman
- First Unique Character in a String
- Minimum Deletions to Make String K-Special
- Number of Students Unable to Eat Lunch