Given a string, find the length of the longest substring without repeating characters.
Examples:
Given "abcabcbb", the answer is "abc", which the length is 3.
Given "bbbbb", the answer is "b", with the length of 1.
Given "pwwkew", the answer is "wke", with the length of 3. Note that the answer must be asubstring, "pwke" is a subsequence and not a substring.

本文探讨了如何找出给定字符串中最长的无重复字符子串,并提供了几个示例进行说明,例如对于字符串abcabcbb,最长的无重复字符子串为abc,长度为3。
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