How to Perform a Counting Using Array and Hash Table

A simple C++ solution to Leetcode 387. First Unique Character in a String.

How To Check If a String Is a Valid Anagram

Three C++ solutions for solving Leetcode 242. Valid Anagram. An anagram is a word formed by rearranging the letters of another word.

How To Uniquify Email Addresses

Two C++ solutions to Leetcode challenge 929. Unique Email Addresses. One removes the ignored parts according to the rules. One builds the email addresses from scratch.