hash-map

Deep copying an undirected graph using a hash map and DFS recursion in Python

Grouping anagram strings by using each sorted string as the hash map key

A 3Sum solution using sorting and a two-sum-style hash map approach.

A comparison of sorting and character counting for the Valid Anagram problem.

Using frequency counting and bucket arrays to return the top k frequent elements

Comparing brute force, two-pass hash map, and one-pass hash map approaches for Two Sum