# Hash Table

- [4Sum](/leetcode-problems/hash-table/4sum.md)
- [Subarray Sum Equals K](/leetcode-problems/hash-table/subarray-sum-equals-k.md)
- [Group Anagrams](/leetcode-problems/hash-table/group-anagrams.md)
- [Valid Anagram](/leetcode-problems/hash-table/valid-anagram.md)
- [First Unique Character in String](/leetcode-problems/hash-table/first-unique-character-in-string.md)
- [Valid Sudoku](/leetcode-problems/hash-table/valid-sudoku.md)
- [Contains Duplicates](/leetcode-problems/hash-table/contains-duplicates.md)
- [Contains Duplicates II](/leetcode-problems/hash-table/contains-duplicates-ii.md)