Oulipo

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 55633		Accepted: 21703

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

3BAPCBAPCAZAAZAZAZAVERDIAVERDXIVYERDIAN

Sample Output

130

Source

 

 

题目大意：给你两个字符串p和s，求出p在s中出现的次数，求的是主串和子串的匹配问题。

#include
     
      #include
      
       #include
       
        #include
        
         #include
         
          #include
          
           typedef long long ll;using namespace std;const int N=100010;char s[N * 10], p[N];int nextval[N];int lens, lenp;void getnext(){ int i=0,j=-1; nextval[0]=-1; while(i!=lenp){ if(j==-1||s[i]==s[j]) nextval[++i]=++j; else j=nextval[j]; }} int KMP(){ int i=0,j=0,count=0; while(i != lens && j != lenp){ if(s[i] == p[j] || j == -1) ++i, ++j; else j = nextval[j]; if(j == lenp){ count++; j = nextval[j]; } } return count;} int main(){ freopen("3461.in","r",stdin); freopen("3461.out","w",stdout); int ncase; int len; int ans; scanf("%d", &ncase); while(ncase--){ scanf("%s%s", p, s); lens=strlen(s); lenp=strlen(p); getnext(); ans=KMP(); printf("%d\n", ans); } return 0;}