Given a string, find the first non-repeating character in it and return it's index.

给定一个字符串，找出其中第一个不重复出现的字符，返回其位置索引。

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Given a string, find the first non-repeating character in it and return it's index.

给定一个字符串，寻找第一个不重复字符并返回其下标。

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For the carriage return and linefeed character combination.

作为回车符和换行符的组合。

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For the carriage return and linefeed character combination.

作为回车符和换行符的组合。

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