Find the longest substring that does not contain any duplicate characters.

Question

Anonymous · Accepted Answer

Used hashmaps

Anonymous · Answer

def longest_without_duplicates(st):
    n=len(st)
    if n<=1:
        return st
    _max=1
    p0=-1
    p1=-1
    letters=set()
    unvalid_letter=None
    while p0

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