https://leetcode.com/problems/longest-substring-without-repeating-characters/description/
Given a string, find the length of the longest substring without repeating characters.
Example 1:
Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2:
Input: "bbbbb" Output: 1 Explanation: The answer is "b", with the length of 1. Example 3:
Input: "pwwkew" Output: 3 Explanation: The answer is "wke", with the length of 3. Note that the answer must be a substring, "pwke" is a subsequence and not a substring.
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class Solution: def lengthOfLongestSubstring(self, s: str) -> int: if not s: return 0 end = 0 start = 0 res = 0 lookup = set() while start < len(s) and end < len(s): if s[end] not in lookup: lookup.add(s[end]) res = max(res, end - start+1) end += 1 else: lookup.discard(s[start]) start += 1 return res
# 还有更好的解法 不过我没想到