LeetCode 387: First Unique Character in a String — Simple Explanation with Carry Logic (Java)

Difficulty : Easy Topics : Hash Table, String, Queue, Counting Platform : Leetcode Problem Statement Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Problem Statement Simplified Get the index of the first non-repeating character, else return -1. Mistakes and Learning Do not blindly loop thorugh. Do not just delete the duplicates, remove the duplicated character also. Example 1 `Input: s = "leetcode" Output: 0 Explanation: The