Find first non-repeating character in string#coding #learnwithrehan #javaprogramming #javalanguage

In this quick tutorial you'll learn how to find the first non-repeating character in a string.
Approach: first pass — count frequency (hashmap or array), second pass — return first char with frequency 1. This is an O(n) time and O(k) extra space solution (k = alphabet size).
Examples shown and a short code demo (Java / Python). Great for interview prep and algorithm practice.
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