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2018.12.1-leetcode387/Be a fresh man.md
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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。
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### 1.2 输入与输出
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输入:
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-* string s:输入的字符串s
+* string s:输入的字符串 s
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输出:
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* int:它的第一个不重复的字符的索引
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