longest substring without duplicate characters@leetcode

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Longest Substring Without Repeating Characters

 

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Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. For "bbbbb" the longest substring is "b", with the length of 1.

用位运算来判断是否有重复的character，另外注意运算符的优先级和顺序。