Theme Section Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1114    Accepted Submission(s): 579 Problem Description It's time for music! A lot of popular musicians are invited to join us in t…

http://acm.hdu.edu.cn/showproblem.php?pid=4763 Theme Section Problem Description   It's time for music! A lot of popular musicians are invited to join us in the music festival. Each of them will play one of their representative songs. To make the pro…

给定一个字符串,求出一个前缀A,使得字符串的构成可以表示成ABABA的形式(B可以为空串). 输出这个前缀的最大长度. KMP算法Next数组的使用. 枚举中间的每个位置,可以根据Next数组求出这个位置对应的前缀.然后暴力判断前缀与后缀是否相等即可. 如图,枚举的位置为 i,则Next[i] = j,.然后判断0~j 是否和 k~len是否是相同的. 注意要判断合法性,即前缀 + 中缀的长度不能比当前枚举的位置大,且后缀开始的位置一定要比当前枚举的位置大. 判定完Next[i]后,一定要判定N…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4763 题意:给出一个字符串,问能不能在该串的前中后部找到相同的子串,输出最长的字串的长度. 分析:kmp的next[]数组应用. next[i]=k表示在位置i之前有k个字符与字符串前k个字符相同,利用这个性质,先求出next[]数组,注意next[len]也要求出来,next[i]就表示字符串的后部与前部相同的长度,这样就只需找有没有中部就可以了.在next[i]到len-next[i]之间找有没…

这题数据水的一B.直接暴力都能够过. 比赛的时候暴力过的.回头依照正法做了一发. 匹配的时候 失配函数 事实上就是前缀 后缀的匹配长度,之后就是乱搞了. KMP的题可能不会非常直接的出,可是KMP的思想常常渗透在非常多题目里面,近期须要多练习一下. #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int maxn = 1000005; int _next[…

题目链接:https://vjudge.net/problem/HDU-4763 Theme Section Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4264    Accepted Submission(s): 2056 Problem Description It's time for music! A lot of popu…

Theme Section Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1995 Accepted Submission(s): 943 Problem Description It's time for music! A lot of popular musicians are invited to join us in the mus…

http://acm.hdu.edu.cn/showproblem.php?pid=4763 Theme Section Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2129    Accepted Submission(s): 997 Problem Description It's time for music! A lot of…

Theme Section Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5091    Accepted Submission(s): 2550 Problem Description It's time for music! A lot of popular musicians are invited to join us in t…

Theme Section Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 574    Accepted Submission(s): 308 Problem Description It's time for music! A lot of popular musicians are invited to join us in th…