Hash table | Landisland

Algorithm|Hash table|3Sum

LeetCode 454. 3Sum

Algorithm|Hash table|4Sum II

LeetCode 454. 4Sum II

Algorithm|Hash table|Ransom Note

LeetCode 383. Ransom Note

Algorithm|Hash table|Two Sum

LeetCode 1. Two Sum

Algorithm|Hash table|Happy Number

LeetCode 202. Happy Number

Algorithm|Hash table|Intersection of Two Arrays

LeetCode 349. Intersection of Two Arrays

Algorithm|Hash table|Valid Anagram

LeetCode 242. Valid Anagram