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Leetcode 190. Reverse Bits. Python. Bit Manipulation

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Given a string s, find the length of the longest substring without repeating characters. class Solution:     def lengthOfLongestSubstring(self, s: str) -> int:         charSet = set()         left = 0         ans = 0         for right in range(len(s)):             while s[right] in charSet:                 charSet.remove(s[left])                 left+=1             charSet.add(s[right])             ans = max(ans, right-left+1)         return ans                  Explained :