First Unique Character in a String
Leetcode problem 387; Difficulty: Easy
Problem Statement
Given a string s, return the first non-repeating character in it and return its index. If it does not exist, return -1.
Constraints:
1 <= s.length <= 105sconsists of only lowercase English letters.
Example 1:
Input: s = "leetcode"
Output: 0
Example 2:
Input: s = "loveleetcode"
Output: 2
Example 3:
Input: s = "aabb"
Output: -1
Submitted Solution
The implemented solution received the following rating on Leetcode:
