hdu 1686 Oulipo KMP 매 칭 횟수 통계

/*Oulipo



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

Total Submission(s): 5769    Accepted Submission(s): 2322





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

*/

//KMP

#include <cstdio>

#include <cstring>

const int maxn = 10000 + 10, maxm = 1000000 + 10;

int next[maxn], len1, len2;

char a[maxn], b[maxm];

void getNext()

{

    int i, j = 0, k = -1;

    next[0] = -1;

    while(j < len1){

        if(k == -1 || a[j] == a[k]) next[++j] = ++k;

        else k = next[k];

    }

} 

int kmp()

{

    int i = 0, j = 0, ans = 0;

    while(i < len2){

        while(j != -1 && b[i] != a[j]) j = next[j];

        i++; j++;

        if(j >= len1){

            ans++;

            j = next[j];

        }

    }

    return ans;

}

int main()

{

    int T;

    scanf("%d", &T);

    while(T--){

        scanf("%s%s", a, b);

        len1 = strlen(a); len2 = strlen(b);

        getNext();

        printf("%d
", kmp());

    }

    return 0;

}