题目来自 https://leetcode.com/problems/longest-palindromic-substring/ 题目: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. 给一个字符串…

题意: 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.  (Medium) 分析: 采用动态规划,dp[i][j]表示从s[i]到s[j]的字串是否回文,然后按照字串长度进行遍历,如果s[i] ==…

描述:给一个字符串s,查找它的最长的回文子串.s的长度不超过1000. Input: "babad" Output: "bab" Note: "aba" is also a valid answer. 我是采用动态规划解决此题的.官方的solutions中提供了几种思路,包括我使用的DP.这里摘要如下: 思路1: 将s反转得到s',然后查找s和s'的最长公共子串substring,那么substring就是最长回文子串.比如:s = "…

题目链接:https://leetcode.com/problems/longest-palindromic-substring/ 题意很简单,就是求一个字符串得最长子串,这里的子串指连续的. 本文给出四个不同时间的解法.在LeetCode上的用时分别是500ms,250ms,60ms以及6ms. (1)500ms-最朴素解法 这种解法相当于模拟求解了,是一种正向思维,即枚举所有起点和终点,判断长度是否最长,且是回文的.时间复杂度O(n3).代码如下: class Solution { publ…

给定一个字符串 s,找到 s 中最长的回文子串.你可以假设 s 的最大长度为1000. 示例 1: 输入: "babad" 输出: "bab" 注意: "aba"也是一个有效答案. 示例 2: 输入: "cbbd" 输出: "bb" 暴力法: class Solution { public: string longestPalindrome(string s) { int len = s.size(); i…

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Example: Input: "cbbd" Ou…

题目: 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. 解题思路: 主要有三种: 第一种:Manacher算法,也是最快的,时间复杂度为O(n) 第二种:DP算法,时间复杂度为O(n*n) 第三种:…

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: Input: "cbbd"…

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, and there exists one unique longest palindromic substring. 即给定一个字符串,求它的最长回文子串的长度(或者最长回文子串). 解法一 对于一个问题,一定可以找到一个傻的可爱的暴力解法,本题的暴力解法即…

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. 这道题让我们求最长回文子串,首先说下什么是回文串,就是正读反读都一样的字符串,比如 "bob", "level", &q…

问题: 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. 官方难度: Medium 翻译: 给定一个字符串S,找出最长回文子串,你可以假定字符串的最大长度为1000,并且只有一个最长回文子串. 例子:…

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. 题目的意思:输入一个字符串S,找出其最长回文串 用动态规划求解 决策变量:dp[i][j]记录从s[i]到s[j]组成的子串是否为回文. dp[i+1…

Given a , and there exists one unique longest palindromic substring. https://leetcode.com/problems/longest-palindromic-substring/ 求最大回文的长度,其实这道题比上一道有意思. 方法1 循环查询 (该方案为O(N*N*N)) public static boolean isPalindrome(String s, int start, int end) { if (((…

LeetCode: 5. Longest Palindromic Substring class Solution { public: //动态规划算法 string longestPalindrome(string s) { int n = s.length(); int longestBegin = 0; int maxLen = 1; bool table[1000][1000] = {false}; for (int i = 0; i < n; i++) { table[i][i] =…

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of Sis 1000, and there exists one unique longest palindromic substring. == class Solution { public: string longestPalindrome(string s) { /**bool dp[…

题目 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. 答案 一道动规题目,每次用当前位置columnIndex跟前面位置rowIndex去比较时,如果相同的话,就去看columnIndex- 1和r…

[译+改]最长回文子串(Longest Palindromic Substring) Part II 原文链接在http://leetcode.com/2011/11/longest-palindromic-substring-part-ii.html 原文作者有些地方逻辑上有点小问题,我做了纠正.关于解释时间复杂度上,原作者就只有两句话,我无法理解,特意在此加强了,便于理解. 问题:给定字符串S,求S中的最长回文子串. 在上一篇,我们给出了4种算法,其中包括一个O(N2)时间O(1)空间的算法…

[译]最长回文子串(Longest Palindromic Substring) Part I 英文原文链接在(http://leetcode.com/2011/11/longest-palindromic-substring-part-i.html) +BIT祝威+悄悄在此留下版了个权的信息说: 问题:给定字符串S,求S中的最长回文子串. 这个有趣的问题常常在面试中出现.为什么呢?因为解决办法有很多种.单单我知道的就有5种.你能解决这个问题吗?来Online Judge试试看吧! 提示 首先你…

写在前面:忍不住吐槽几句今天上海的天气,次奥,鞋子里都能养鱼了...裤子也全湿了,衣服也全湿了,关键是这天气还打空调,只能瑟瑟发抖祈祷不要感冒了.... 前后切了一百零几道leetcode的题(solution同步在github),主要是拣难度系数定为easy的水题做...好吧,这是第一道算法题.不知哪位大神说的,所有的语言都会过时,只有数据结构和算法才是永恒. 今天要重点讲的是优雅的Manacher算法,先来看这道题Longest Palindromic Substring,题目很简单,给你一…

要求: Given a string S, find the longest palindromic substring in S. (从字符串 S 中最长回文子字符串.) 何为回文字符串? A palindrome is a string which reads the same in both directions. For example, “aba” is a palindome, “abc” is not. 解决方法:参考:http://leetcode.com/2011/11/lon…

题目链接 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. 求字符串的最长回文子串 算法1:暴力解法,枚举所有子串,对每个子串判断是否为回文,复杂度为O(n^3) 算法2:删除暴力解法中有很多重复的判…

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. 解题思路一: 暴力枚举 共N^2量级个子串(从下标零开始),每次检查需一个for循环,等于是3重for循环,时间复杂度O(n^3) 解题思路二: 动态…

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…

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. (1) class Solution { public: string longestPalindrome(string s) { if (s ==…

题目: 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:用Manacher算法得到最大回文子串的长度,得到带#的最大回文子串,用split剔除#后转化成String形式输出即可. public…

5. Longest Palindromic Substring Total Accepted: 120226 Total Submissions: 509522 Difficulty: Medium Given a string s, find the longest palindromic(回文) substring in sS. You may assume that the maximum length of s is 1000, and there exists one unique…

题目: 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. 代码: class Solution { public: string longestPalindrome(string s) { const…

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. 动态规划 public class Solution { public String longestPalindrome(String s) { if…