HashMap HashTable

Interview Questions

1. Implement a hash map from scratch with basic operations (get, put, delete).
2. Find two numbers in an array that add up to a target value using a hash table.
3. Find the first non-repeating character in a string using a hash table.
4. Check if two strings are anagrams using a hash table.
5. Group anagrams from a list of strings.
6. Implement an LRU (Least Recently Used) Cache using a hash table and a doubly linked list.
7. Find the longest substring without repeating characters.
8. Count the frequency of characters in a string.
9. Find the common elements between two arrays.
10. Check if a given array contains duplicate elements within k distance from each other.