Palindrome Time Limit: 15000MS   Memory Limit: 65536K Total Submissions: 3280   Accepted: 1188 Description Andy the smart computer science student was attending an algorithms class when the professor asked the students a simple question, "Can you pro…

Palindrome poj-3974 题目大意:求字符串的最长回文子串. 注释:$1\le strlen(s) \le 10^6$. 想法:介绍一种字符串算法——Manacher.求以每一个字符和字符间隔为回文中心的回文半径长度.什么是Manacher? 我们先来考虑这样一种暴力:如果我们用暴力来达到Manacher的效果,我们需要枚举每一个字符以及字符间隔,然后分别向左右扩展更新当前答案,时间复杂度$O(n^2)$,极限数据:连续的同样字符.那么,我们如何对其进行优化? 我们显然不怎么会处理…

[学习笔记]字符串-马拉车(Manacher) 一:[前言] 马拉车用于求解连续回文子串问题,效率极高. 其核心思想与 \(kmp\) 类似:继承. --引自 \(yyx\) 学姐 二:[算法原理] 对于任意一个回文串 \(a\),设其中点为 \(mid\)(为方便描述,偶数串则在正中央加一个位置),那么根据定义,有: \(a[mid-1]==a[mid+1]\) \(a[mid-2]==a[mid+2]\) \(...\) 可知: 如果 \(a[mid-x]\) 可以形成半径为 \(r\) 的…

Time Limit: 15000MS   Memory Limit: 65536K Total Submissions: 5121   Accepted: 1834 Description Andy the smart computer science student was attending an algorithms class when the professor asked the students a simple question, "Can you propose an eff…

http://poj.org/problem?id=3974 Palindrome Time Limit: 15000MSMemory Limit: 65536K Total Submissions: 2707Accepted: 995 Description Andy the smart computer science student was attending an algorithms class when the professor asked the students a simpl…

本文版权归ljh2000和博客园共有,欢迎转载,但须保留此声明,并给出原文链接,谢谢合作. 本文作者:ljh2000 作者博客:http://www.cnblogs.com/ljh2000-jump/转载请注明出处,侵权必究,保留最终解释权! Description Andy the smart computer science student was attending an algorithms class when the professor asked the students a si…

Palindrome Time Limit: 15000MS   Memory Limit: 65536K Total Submissions: 13157   Accepted: 5028 Description Andy the smart computer science student was attending an algorithms class when the professor asked the students a simple question, "Can you pr…

Palindrome Time Limit: 15000MS   Memory Limit: 65536K Total Submissions: 14021   Accepted: 5374 题目链接:http://poj.org/problem?id=3974 Description: Andy the smart computer science student was attending an algorithms class when the professor asked the st…

题目大意就是说在给定的字符串里找出一个长度最大的回文子串. 才开始接触到manacher,不过这个算法的确很强大,这里转载了一篇有关manacher算法的讲解,可以去看看:地址 神器: #include <map> #include <set> #include <stack> #include <queue> #include <cmath> #include <ctime> #include <vector> #inc…

链接:点击这里 #include<iostream> #include<algorithm> #include<stdio.h> #include<cstring> using namespace std; #define maxn 1000005 #define LL long long #define ull unsigned long long ; ull p[maxn+],f[maxn],ff[maxn]; int main(){ p[]=; ;j&…