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LeetCode

Given a string s, find the length of the longest substring without repeating characters.

Input: s = "abcabcbb"Output: 3

class Solution:

def lengthOfLongestSubstring(self, s):

# TODO: Implement sliding window

Problem Parsed

Strategy: Sliding Window

Use a set to store characters in the current window. Expand right, contract left if duplicate found.

Code Generated

charSet = set()

l = 0

for r in range(len(s)):

while s[r] in charSet:

charSet.remove(s[l])

l += 1

charSet.add(s[r])

res = max(res, r - l + 1)

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