First Unique Character In String - Latest Information & Updates 2026

Web Reference: First Unique Character in a String. Given a string s, find the first non-repeating character in it and return its index. If it does not exist, return -1. Example 1: The character 'l' at index 0 is the first character that does not occur at any other index. Example 2: Example 3: Constraints: s consists of only lowercase English letters. Apr 7, 2025 · The idea is to use two nested loops, the outer loop for picking an element and the inner loop for finding another occurrence of the picked character in the string. Find the first unique character: Second pass through the string in order, checking each character's frequency. The first character with frequency 1 is our answer. Why do we need the second pass? Because we want the first non-repeating character by position, not just any non-repeating character.

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Last Updated: April 3, 2026

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