Oulipo

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 7203    Accepted Submission(s): 2869

Problem 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
   
   
   
   

这道题看似简单其实不然，用普通的方法容易超时，kmp是解决它的很好选择；

#include<stdio.h>
#include<string.h>
char a[10010],b[1000010];
int p[100010];
int len1,len2,ans;
void attain()
{
int i,j;
i=0;j=-1;
p[i]=j;
while(i<len1)
{
if(j==-1||a[i]==a[j])
{
i++;j++;
p[i]=j;
}
else j=p[j];
}
}
void kmp()
{
attain();
int i=0,j=0;
while(i<len2)
{
if(j==-1||a[j]==b[i])
{
i++;j++;
if(j==len1)
ans++;
}
else j=p[j];
}
}
int main()
{
int n;
scanf("%d",&n);
while(n--)
{
scanf("%s%s",a,b);
ans=0;
len1=strlen(a);
len2=strlen(b);
kmp();
printf("%d\n",ans);
}
return 0;
}