链接:https://ac.nowcoder.com/acm/contest/908/G 题意: A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. For example, ”a”.”aba”.“abba” are palindrome and “abc”.”aabb” are not. Let’s d…

/* * 5.Longest Palindrome substring * 2016-4-9 by Mingyang 自然而然的想到用dp来做 * 刚开始自己做的时候分的条件太细,两个index相等,相差小于3,还有其他 * 但这里这个if写的很好,一个代表了所有为true的情况 * 根本不用管为false的情况,因为自然而然为false * */ public String longestPalindrome(String s) { String res = " "; if (s =…

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. 面DP题的考官都是神经病. .(吐槽) 貌似挺easy出回文的题,那么今天细致分析下DP的做法!! 以解我被DP问题虐成渣渣的心碎感觉.如有错误请指出…

对于字符串S, 要找到它最长的回文子串,能想到的最暴力方法,应该是对于每个元素i-th都向左向右对称搜索,最后用一个数组span 记录下相对应元素i-th为中心的回文子串长度. 那么问题来了: 1. 这样的方法,对于奇回文子串和偶回文子串的处理不一样,比如所“acbca” 和“acbbca” 2. 计算冗余,e.g. ”sscssabcccchccccba“中, 自左向右遍历计算的话,会发现, ”abcccchccccba“是对称的,而这个回文字符串里又左右对称分别包含了两个回文子字符”cccc…

回文检测,参考http://blog.csdn.net/feliciafay/article/details/16984031 使用时间复杂度和空间复杂度相对较低的动态规划法来检测,具体的做法 图一 偶数个回文字符情况 图二 奇数个回文字符情况 核心就是如果一个子串是回文,如果分别向回文左右侧扩展一个字符相同,那么回文就向外扩展一位. 实现的代码如下 ][] = {false}; ; ; int n = s.size(); ; iLoop < n; ++iLoop) { table[iLoop]…

这两天去学了一下,觉得下面那篇文章写的很好,有例子,比较容易懂,所以转一下. 以下内容来自:hihoCoder: 小Hi和小Ho是一对好朋友,出生在信息化社会的他们对编程产生了莫大的兴趣,他们约定好互相帮助,在编程的学习道路上一同前进. 这一天,他们遇到了一连串的字符串,于是小Hi就向小Ho提出了那个经典的问题:“小Ho,你能不能分别在这些字符串中找到它们每一个的最长回文子串呢?” 小Ho奇怪的问道:“什么叫做最长回文子串呢?” 小Hi回答道:“一个字符串中连续的一段就是这个字符串的子串,而回文…

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"…

转载地址:https://www.cnblogs.com/clnchanpin/p/6880322.html 假设一个字符串从左向右写和从右向左写是一样的,这种字符串就叫做palindromic string.如aba,或者abba.本题是这种,给定输入一个字符串.要求输出一个子串,使得子串是最长的padromic string. 下边提供3种思路 1.两侧比较法 以abba这样一个字符串为例来看,abba中,一共同拥有偶数个字.第1位=倒数第1位.第2位=倒数第2位......第N位=倒数第N…

1. 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. 注: palindromic substring :回文序列,如:aba,abba 等. 2.1   C++    暴力解决—— 时间复…

假设一个字符串从左向右写和从右向左写是一样的,这种字符串就叫做palindromic string.如aba,或者abba.本题是这种,给定输入一个字符串.要求输出一个子串,使得子串是最长的padromic string. 下边提供3种思路 1.两側比較法 以abba这样一个字符串为例来看,abba中,一共同拥有偶数个字.第1位=倒数第1位.第2位=倒数第2位......第N位=倒数第N位 以aba这样一个字符串为例来看,aba中.一共同拥有奇数个字符.排除掉正中间的那个字符后,第1位=倒数第1…

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This is case sensitive, for example "Aa" is not considered a palindrome here. Note: Assume the leng…

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…

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 (((…

[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…

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…

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 ==…

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…

LeetCode(4) || Longest Palindromic Substring 与 Manacher 线性算法 题记 本文是LeetCode题库的第五题,没想到做这些题的速度会这么慢,工作之余全部耗在这上面了,只怪自己基础差.本文主要介绍使用Manacher线性算法来求解字符串的最长回文子字符串. 题目 Given a string S, find the longest palindromic substring in S. You may assume that the maxim…

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. Solution Palindrome类型的题目的关键都是这个递推表达式: dp[i][j] = (s[i] == s[j]) &&a…

Finding the Longest Palindromic Substring in Linear Time Finding the Longest Palindromic Substring in Linear TimeFred AkalinNovember 28, 2007 Another interesting problem I stumbled across on reddit is finding the longest substring of a given string t…

原文地址: http://articles.leetcode.com/2011/11/longest-palindromic-substring-part-i.html 转载请注明出处:http://www.cnblogs.com/zhxshseu/p/4947609.html 问题描述:Given a string S, find the longest palindromic substring in S. 这道题目是一个经典的动态规划DP http://challenge.greplin.…

需求: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. 如果一个字符串从左向右写和从右向左写是一样的,这样的字符串就叫做palindromic string 判断回文数,中间开花.定一个中心,向两边散…

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"…

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"…

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…

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…

[SP1812]LCS2 - Longest Common Substring II 题面 洛谷 题解 你首先得会做这题. 然后就其实就很简单了, 你在每一个状态\(i\)打一个标记\(f[i]\)表示状态\(i\)能匹配到最长的子串长度, 显然\(f[i]\)可以上传给\(f[i.fa]\). 然后去每个串和第\(1\)个串\(f\)的最小值的最大值即可. 代码 #include <iostream> #include <cstdio> #include <cstdlib&…

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. 题解: 第一种方法就是挨个检查,维护全局最长,时间复杂度为O(n3),会TLE. 代码如下:  1 public String longest…

Markdown版本笔记 我的GitHub首页 我的博客 我的微信 我的邮箱 MyAndroidBlogs baiqiantao baiqiantao bqt20094 baiqiantao@sina.com 领扣-5 最长回文子串 Longest Palindromic Substring MD 目录 目录最长回文子串 Longest Palindromic Substring问题暴力循环法(最基础的方式)暴力循环法1暴力循环法2动态规划法(主流方式)技巧性型方法中心扩展算法(逻辑清晰)最长公…

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…