Leetcode 3: Longest Substring Without Repeating Characters

求解最长不重复子串 Python 3 实现:

源代码已上传 Github,持续更新。

"""
3. Longest Substring Without Repeating Characters

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

Examples:
Given "abcabcbb", the answer is "abc", which the length is 3.
Given "bbbbb", the answer is "b", with the length of 1.
Given "pwwkew", 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.
"""

class Solution:
    def lengthOfLongestSubstring(self, s):
        """
        :type s: str
        :rtype: int
        """

        max_len = 0
        left = 0
        right = 0
        dic = {}
        sub_len = 0
        while right < len(s):
            right_value = s[right]
            if right_value in dic and dic[right_value] >= left:
                sub_len = right - left
                max_len = max(max_len, sub_len)
                left = dic[right_value] + 1
                dic[right_value]=right
                right += 1
            else:
                dic[right_value]=right
                right += 1
                sub_len = right - left
                max_len = max(max_len, sub_len)

        return max(max_len, sub_len)


if __name__ == '__main__':

    solution = Solution()
    print(solution.lengthOfLongestSubstring('abcabcbb'))

源代码已上传至 Github,持续更新中。

    原文作者:e227f7966522
    原文地址: https://www.jianshu.com/p/1a4c95748832#comments
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
点赞