题目链接 对一个字符串,找出一个最长的子串长度,这个子串中所有字符出现的次数至少为k. 1.滑动窗口 一开始把题目看成了,子串中每个字符至多出现k次.如果是这样,那么是一道典型的滑动窗口的题目. 然而,题目是至少出现k次.这样一来,滑动窗口不再适用.因为,在字符出现至多k次的问题中,当窗口尾部的字符超过k个,意味着只需要将窗口头部往后移动直至尾部字符等于k个:当尾部字符出现次数小于k次时,只需要将窗口尾部继续往后移动即可.而在字符出现至少k次的问题中,当尾部字符出现次数小于k次时,无法判断是移动…

395. Longest Substring with At Least K Repeating Characters 我的思路是先扫描一遍,然后判断是否都满足,否则,不满足的字符一定不出现,可以作为分割符,然后不断切割,重复这个过程,我不知道运行时间,感觉会tle,然后交了,就ac了. class Solution { public: int work(string &s, int k, int x, int y) { if(y - x + 1 < k) return 0; set<…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/longest-substring-with-at-least-k-repeating-characters/description/ 题目描述: Find the length of the longest substring T of a given string (consists of lowercase…