← 返回 goldmansachs 的题目列表First Unique Character in a String
类型：online_judge
Given a string, find the first non-repeating character in it and return its index. If it does not exist, return -1.
Examples
Example 1:
Input: s = "leetcode"
Output: 0
Example 2:
Input: s = "loveleetcode"
Output: 2
Example 3:
Input: s = "aabb"
Output: -1
Note
You may assume the string contains only lowercase English letters.
Example
Input
leetcode