Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input:s1 = "ab" s2 = "eidbaooo"…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/permutation-in-string/description/ 题目描述: Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one…

网址:https://leetcode.com/problems/permutation-in-string/ 参考:https://leetcode.com/problems/permutation-in-string/discuss/102588/Java-Solution-Sliding-Window 把s1的各个字母的出现次数记录下来,对s2利用滑动窗口法,逐步移动窗口,判断当前窗口内字符串是否是s1的全排列之一.容易想到,窗口内的字符对应的出现次数要-1.所以,当字符从窗口左端脱离窗口…

Problem statement: Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input:s1 = "ab" s2 = &…

Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input: s1 = "ab" s2 = "eidbaooo"…

［抄题］: Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input:s1 = "ab" s2 = "eidbaooo…

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Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input:s1 = "ab" s2 = "eidbaooo"…

3. 无重复字符的最长子串 A: 要找最长的无重复子串,所以用一个map保存出现过的字符,并且维持一个窗口,用le和ri指针标识.ri为当前要遍历的字符,如果ri字符在map中出现过,那么将le字符从map移除,le++.如果ri字符没出现过,那ri++,并更新最大无重复子串长度.全程利用map保持无重复的要求,每次循环要么le++,要么ri++.最差情况是n个一样的字符,那么ri++,le++,ri++,le++这样一直从0循环到n-1.时间复杂度和空间复杂度都是O(N). class Sol…

什么是滑动窗口(Sliding Window) The Sliding Problem contains a sliding window which is a sub – list that runs over a Large Array which is an underlying collection of elements. 滑动窗口算法可以用以解决数组/字符串的子元素问题,它可以将嵌套的循环问题,转换为单循环问题,降低时间复杂度. 比如找最长的全为1的子数组长度.滑动窗口一般从第一个元…