# [387. First Unique Character in a String](https://leetcode.com/problems/first-unique-character-in-a-string/)

## 题目

Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1.

**Examples:**

    s = "leetcode"
    return 0.
    
    s = "loveleetcode",
    return 2.

**Note:** You may assume the string contain only lowercase letters.



## 题目大意

给定一个字符串，找到它的第一个不重复的字符，并返回它的索引。如果不存在，则返回 -1。


## 解题思路

- 简单题，要求输出第一个没有重复的字符。