Given a string s, find the length of the longest substring without repeating characters. For example, if the input is "abcabcbb", the output should be 3, because the longest substring without repeating characters is "abc". If the input is "bbbbb", the output should be 1, because the longest substring without repeating characters is "b".
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Given a string s, find the length of the longest substring without repeating characters.
For example, if the input is "abcabcbb", the output should be 3, because the longest substring without repeating characters is "abc". If the input is "bbbbb", the output should be 1, because the longest substring without repeating characters is "b".
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