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3.无重复字符的最长子串.py
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58 lines (55 loc) · 1.33 KB
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#
# @lc app=leetcode.cn id=3 lang=python
#
# [3] 无重复字符的最长子串
#
# https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/description/
#
# algorithms
# Medium (31.26%)
# Likes: 2473
# Dislikes: 0
# Total Accepted: 227.3K
# Total Submissions: 721.1K
# Testcase Example: '"abcabcbb"'
#
# 给定一个字符串,请你找出其中不含有重复字符的 最长子串 的长度。
#
# 示例 1:
#
# 输入: "abcabcbb"
# 输出: 3
# 解释: 因为无重复字符的最长子串是 "abc",所以其长度为 3。
#
#
# 示例 2:
#
# 输入: "bbbbb"
# 输出: 1
# 解释: 因为无重复字符的最长子串是 "b",所以其长度为 1。
#
#
# 示例 3:
#
# 输入: "pwwkew"
# 输出: 3
# 解释: 因为无重复字符的最长子串是 "wke",所以其长度为 3。
# 请注意,你的答案必须是 子串 的长度,"pwke" 是一个子序列,不是子串。
#
#
#
import collections
class Solution(object):
def lengthOfLongestSubstring(self, s):
"""
:type s: str
:rtype: int
"""
ans=0
lookup=collections.deque()
for right in range(len(s)):
while s[right] in lookup:
lookup.popleft()
lookup.append(s[right])
if len(lookup)>ans:ans=len(lookup)
return ans