Longest substring without repeating characters

Name: PyRun — Python Playground
Availability: InStock

MediumPattern: Sliding window

Write longest_unique(s) that returns the length of the longest substring with no repeated character.

longest_unique("abcabcbb")  ->  3     # "abc"
longest_unique("pwwkew")    ->  3     # "wke"

solution.py

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