LeetCode-First Unique Character in a String
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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.
题目意思时给你一个字符串，找出第一个没有在字符串重复出现的的字符的下标索引号；解题思路：先用hashmap把字符串中每一个字符存储到hashmap中，把字符串重复数存储到key所对应的value中，然后再遍历hashmap,找第一个value等于1的数值对，返回其下标索引即可；
代码如下：
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