Given a string s, find the length of the longest substring without repeating characters. charset=set() "we convert to set so it doesn't add dupicate values to the substring" l=0 "set left pointer to 0 ...
the same number of 0's and 1's, and all the 0's and all the 1's in these substrings are grouped consecutively. Substrings that occur multiple times are counted the number of times they occur.
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