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47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
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---
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title: '3. Longest Substring Without Repeating Characters'
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description: Given a string s, find the length of the longest substring without duplicate characters
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sidebar:
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label: 'Longest Substring Without Repeating Characters'
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badge: 'Medium'
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---
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<Badge variant="accent">Sliding Window</Badge>
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### Example 1:
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- Input: `s = "abcabcbb"`
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- Output: `3`
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- Explanation: The answer is "abc", with the length of `3`. Note that "bca" and "cab" are also correct answers.
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### Example 2:
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- Input: `s = "bbbbb"`
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- Output: `1`
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- Explanation: The answer is "b", with the length of `1`.
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### Example 3:
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- Input: `s = "pwwkew"`
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- Output: `3`
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- Explanation: The answer is "wke", with the length of `3`. Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.
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### Constraints:
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- `0 <= s.length <= 10^5`
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- `s` consists of English letters, digits, symbols and spaces.
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## Solution
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```py
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class Solution:
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def lengthOfLongestSubstring(self, s: str) -> int:
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left = 0
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ans = 0
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seen = set()
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for right, c in enumerate(s):
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while c in seen:
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seen.remove(s[left])
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left += 1
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seen.add(c)
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ans = max(ans, right - left + 1)
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return ans
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```
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