[LeetCode] 387. First Unique Character in a String - 문제풀이
Description 주어진 문자열 s에서 겹치지 않는 첫번째 문자를 찾아내는 문제입니다. 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: Input: s = "leetcode" Output: 0 Example 2: Input: s = "loveleetcode" Output: 2 Example 3: Input: s = "aabb" Output: -1 Constraints: 1
