Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 思路:如果不用动态规划,在两个for循环的情况下,还得依次比较i,j间的每个字符,O(n3).使用动态规划,O(n2) char* longestPa…

Longest Palindromic Substring Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. time=255ms    accepted 暴力遍历 public String lon…

很经典的一道题,最长回文子串,有多种方法. 首先介绍的一种方法是从中间向两边展开.注意区分aba和abba型的回文串:如果当前最长的子串已经当于两边中最长的子串了,则无需再去判断. //从中间向两边展开 string expandAroundCenter(string s, int c1, int c2) { int l = c1, r = c2; int n = s.length(); && r <= n - && s[l] == s[r]) { l--; r++;…

原题链接:https://leetcode.com/problems/longest-palindromic-substring/description/ 1. 题目要求:找出字符串中的最大回文子串 2. 注意:要考虑回文子串中的字符个数是奇数还是偶数!!! 例如,“aabaa”是一个奇数个字符的回文字符串,他的中心只有一个字符“b”. “aabbaa”是一个偶数个字符的回文字符串,他的中心却有两个相同字符“bb” 3. 思路:暴力解决,以每个字符为中心,对该字符的两边进行匹配,找出最长的回文子…

Question:Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring.(给定一个字符串S,在S中找到最长的回文子字符串,假定最长的回文字符串长度是1000,并且在这个字符串中存在唯一的一个最长回文子字符串…

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 方法: Manacher's algorithm,具体看这里http://leetcode.com/2011/11/longest-palindrom…

题目来源:https://leetcode.com/problems/longest-palindromic-substring/ Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 动态规划,类似于l…

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 玩了两天dota2,罪过罪过,还是应该老老实实刷题啊. 题目求得是最长的回文子串,这里使用的是暴力的解法,也就是解决两种回文"asdsa"以…

Level:   Medium 题目描述: Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Example 2:…

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 思路I:动态规划,遍历到i的时候要保证之前的元素都已经计算过状态,所以遍历顺序同插入排序,时间复杂度O(n2) class Solution { pu…