[POJ] 3461 Oulipo [KMP算法]
Time Limit: 1000MS | Memory Limit: 65536K | |
Total Submissions: 23667 | Accepted: 9492 |
Description
The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a member of the Oulipo group. A quote from the book:
Tout avait Pair normal, mais tout s’affirmait faux. Tout avait Fair normal, d’abord, puis surgissait l’inhumain, l’affolant. Il aurait voulu savoir où s’articulait l’association qui l’unissait au roman : stir son tapis, assaillant à tout instant son imagination, l’intuition d’un tabou, la vision d’un mal obscur, d’un quoi vacant, d’un non-dit : la vision, l’avision d’un oubli commandant tout, où s’abolissait la raison : tout avait l’air normal mais…
Perec would probably have scored high (or rather, low) in the following contest. People are asked to write a perhaps even meaningful text on some subject with as few occurrences of a given “word” as possible. Our task is to provide the jury with a program that counts these occurrences, in order to obtain a ranking of the competitors. These competitors often write very long texts with nonsense meaning; a sequence of 500,000 consecutive'T's is not unusual. And they never use spaces.
So we want to quickly find out how often a word, i.e., a given string, occurs in a text. More formally: given the alphabet {'A', 'B', 'C', …, 'Z'} and two finite strings over that alphabet, a word W and a text T, count the number of occurrences of W in T. All the consecutive characters of W must exactly match consecutive characters of T. Occurrences may overlap.
Input
The first line of the input file contains a single number: the number of test cases to follow. Each test case has the following format:
- One line with the word W, a string over {'A', 'B', 'C', …, 'Z'}, with 1 ≤ |W| ≤ 10,000 (here |W| denotes the length of the string W).
- One line with the text T, a string over {'A', 'B', 'C', …, 'Z'}, with |W| ≤ |T| ≤ 1,000,000.
Output
For every test case in the input file, the output should contain a single number, on a single line: the number of occurrences of the word W in the text T.
Sample Input
3
BAPC
BAPC
AZA
AZAZAZA
VERDI
AVERDXIVYERDIAN
Sample Output
1
3
0
Source
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<ctype.h>
#include<stdlib.h>
#include<stdbool.h> #define rep(i,a,b) for(i=(a);i<=(b);i++)
#define clr(x,y) memset(x,y,sizeof(x))
#define sqr(x) (x*x)
#define LL long long int i,j,n,num,
f[]; char p[],t[]; int init()
{
clr(p,'\0');
clr(t,'\0');
clr(f,);
num=; scanf("%s",p);
scanf("%s",t); return ;
} void kmp(char *t, char *p, int *f)
{
int n,m,j;
n = strlen(t); m = strlen(p);
getFail(p,f); j = ; for(i = ;i < n;i++) {
while(j && p[j] != t[i]) j=f[j];
if(p[j] == t[i]) j++;
if(j == m) num++;
} } void getFail(char p[],int f[])
{
int m,j,i;
m = strlen(p);
f[] = ;f[] = ; for(i = ;i < m;i++) {
j = f[i];
while(j && p[i] != p[j]) j = f[j];
f[i+]=p[i]==p[j] ? j+ : ;
}
} int main()
{
int T;
scanf("%d",&T); while(T--) {
init();
getFail(p,f);
kmp(t,p,f);
printf("%d\n",num);
}
return ;
}
[POJ] 3461 Oulipo [KMP算法]的更多相关文章
- POJ 3461 Oulipo KMP算法题解
本题就是给出非常多对字符串,然后问一个字符串在另外一个字符串出现的次数. 就是所谓的Strstr函数啦. Leetcode有这道差点儿一模一样的题目. 使用KMP算法加速.算法高手必会的算法了. 另外 ...
- POJ 3461 Oulipo KMP算法(模板)
题意: 给两组字符串a和b,求a在b中出现的次数 关于KMP: 马拉车算法是处理回文串,而KMP是处理前后缀的相同字符串的最长长度. a | a | b | a | a | f | a | a 数组 ...
- POJ 3461 Oulipo KMP
题意:统计其中一个子串的出现次数 题解:即KMP算法中j==m的次数 //作者:1085422276 #include <cstdio> #include <cmath> #i ...
- POJ 3080 Blue Jeans、POJ 3461 Oulipo——KMP应用
题目:POJ3080 http://poj.org/problem?id=3080 题意:对于输入的文本串,输出最长的公共子串,如果长度相同,输出字典序最小的. 这题数据量很小,用暴力也是16ms,用 ...
- POJ 3461 Oulipo(KMP,模式串在主串中出现次数 可重叠)
题意:给你两个字符串p和s,求出p在s中出现的次数. 显然,我们要先把模式串放到前面,之后主串放后面,中间隔开,这样就可以根据前缀数组的性质来求了. 我先想直接把p接到s前面,之后求Next数组对st ...
- HDU 1686 Oulipo / POJ 3461 Oulipo / SCU 2652 Oulipo (字符串匹配,KMP)
HDU 1686 Oulipo / POJ 3461 Oulipo / SCU 2652 Oulipo (字符串匹配,KMP) Description The French author George ...
- POJ 3461 Oulipo(乌力波)
POJ 3461 Oulipo(乌力波) Time Limit: 1000MS Memory Limit: 65536K [Description] [题目描述] The French autho ...
- POJ 3461 Oulipo[附KMP算法详细流程讲解]
E - Oulipo Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u Submit ...
- POJ 3461 Oulipo(字符串匹配,KMP算法)
题意:给出几组数据,每组有字符串W和T,问你W在T中出现几次. 思路:字符串长度很大,用KMP算法. 一开始写的是:调用KMP算法查找W在T中是否匹配,若匹配,则个数+1.则接下来T的索引移动相应的距 ...
随机推荐
- 对CNN模块的分析
对 CNN 模块的分析,该论文(Systematic evaluation of CNN advances on the ImageNet)已经做过了,里面的发现是非常有帮助的: 使用没有 bat ...
- C#中使用命名管道进行进程通信的实例
原文:C#中使用命名管道进行进程通信的实例 1 新建解决方案NamedPipeExample 在解决方案下面新建两个项目:Client和Server,两者的输出类型均为"Windows 应用 ...
- strcat函数的坑点
我们先看下面这样一段代码: #include <iostream> #include <stdlib.h> using namespace std; int main() { ...
- openstack组件手动部署整合
preface:当你完全且正确的配置好整个OpenStack ENV 你将能看到的和体验到的!!! 我们先来看看简单效果吧,祝君能在这条路上走的更远,更好;
- eucimage
- 360网站卫士常用前端公共库CDN服务
360网站卫士常用前端公共库CDN服务 360网站卫士常用前端公共库CDN服务
- struts1配置文件之input
<action path="/*Person" type="cn.itcast.PersonAction" scope="request&quo ...
- oracle日期计算
查询某月有多少天.代码例如以下: select to_number(add_months( trunc(to_date('2014-11-4 11:13:53','yyyy-mm-dd hh24:mi ...
- DOS命令大全--具体解释
在Linux和Windows下都能够用nslookup命令来查询域名的解析结果 DOS命令大全一)MD--建立子文件夹 1.功能:创建新的子文件夹 2.类型:内部命令 3.格式:MD[盘符:][路径名 ...
- Laravel Eloquent ORM
Eloquent ORM 简介 基本用法 集体赋值 插入.更新.删除 软删除 时间戳 查询范围 关系 查询关系 预先加载 插入相关模型 触发父模型时间戳 与数据透视表工作 集合 访问器和调整器 日期调 ...