题目链接:https://vjudge.net/problem/HDU-3336 Count the string Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 11760    Accepted Submission(s): 5479 Problem Description It is well known that AekdyCoi…

居然一A了,说明对朴素的KMP还是有一定理解. 主要就是要知道next数组的作用,然后就可以计算每个i结尾的满足题意的串个数. #include<cstdio> #include<cstdlib> #include<iostream> #include<cstring> #include<string> #include<algorithm> #include<memory.h> using namespace std;…

It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-empty prefixes of this string. For example:s: "abab"The prefixes are: "a", "ab"…

It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-empty prefixes of this string. For example: s: "abab" The prefixes are: "a", "ab&qu…

It is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s, we can write down all the non-empty prefixes of this string. For example:s: "abab"The prefixes are: "a", "ab"…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3336 很容易想到用kmp 这里是next数组的应用 定义dp[i]表示以s[i]结尾的前缀的总数 那么dp[i]=dp[next[i]]+1; 代码: #include<stdio.h> #include<string.h> ; ; int dp[MAXN]; char str[MAXN]; int next[MAXN]; void getNext(char *p) { int j,k…

欢迎访问~原文出处——博客园-zhouzhendong 去博客园看该题解 题目传送门 - HDU3336 题意概括 给T组数据,每组数据给一个长度为n的字符串s.求字符串每个前缀出现的次数和,结果mod 10007. 题解 首先闭着眼睛KMP跑一跑. 然后我们来dp. dp[i]表示以第i位结尾的前缀个数. 那么,根据Next的含义,不难写出dp[i]=dp[Next[i]]+1的转移方程式. 然后就OK了. 代码 #include <cstring> #include <algorit…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3336 题目大意:找出字符串s中和s的前缀相同的所有子串的个数. 题目分析:KMP模板题.这道题考虑 nxt[] 数组的应用.以 s[i] 结尾的子串中一共有多少个子串可以作为s的前缀呢?我们只要令 t = nxt[i],cnt=0 每当 t!=-1,cnt++, t=nxt[t] 就可以了. 当然,我们可以用dp优化,dp[i] = dp[nxt[i]]+1 ,当然,如果 nxt[i]==-1 ,那…

题意 计算所有S的前缀在S中出现了几次 思路 跟前缀有关的题目可以多多考虑KMP的NEXT数组 #include <cstdio> #include <cstring> #include <iostream> #include <cstdlib> using namespace std; char S[2000000]; int NEXT[2000000]; int dp[2000000];//dp[i] 表示 以i结尾的子串与前缀相等的个数 d[i]=d[…

Count the string Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3351    Accepted Submission(s): 1564 Problem Description It is well known that AekdyCoin is good at string problems as well as n…