HDU-1686 Oulipo（kmp模板题）

B - Oulipo
Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u
Submit Status Practice HDU
1686

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

 

模板题，拿来练手

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<limits.h>
#include<math.h>
#include<algorithm>
using namespace std;
char a[10005],b[1000005];
int p[10005];
int n,m,ans;
void print()
{
int i,j=0;
p[1]=0;
for(i=2;i<=n;i++)
{
while(j>0 && a[j+1]!=a[i])
j=p[j];
if(a[j+1]==a[i])
j++;
p[i]=j;
}
}
void kmp()
{
int i,j=0;
for(i=1;i<=m;i++)
{
while(j>0 && a[j+1]!=b[i])
j=p[j];
if(a[j+1]==b[i])
j++;
if(j==n)
ans++;
}
printf("%d\n",ans);
}
int  main()
{
int T,i,j;
scanf("%d",&T);
while(T--)
{
ans=0;
scanf(" %s",a+1);
scanf(" %s",b+1);
n=strlen(a+1);
m=strlen(b+1);
print();
kmp();
}
}