学步园

裸KMP

#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
int const MAXN = 100010;
char s[MAXN],s1[MAXN * 10];
int next[MAXN],num[MAXN];
void Get_N(int l){
    memset(next,0,sizeof(next));
    for(int i = 1;i < l;i++){
        int j = next[i];
        while(j && s[i] != s[j]) j = next[j];
        if(s[i] == s[j]) next[i + 1] = j + 1;
        else next[i + 1] = 0;
    }
}
void Kmp(){
    int cnt = 0,j = 0;
    int m = strlen(s),n = strlen(s1);
    Get_N(m);
    for(int i = 0;i < n;i++){
        while(j && s1[i] != s[j]) j = next[j];
        if(s1[i] == s[j]) j++;
        if(j == m){
            cnt++;
            j = next[j];
        }
    }
    printf("%d\n",cnt);
}
int main(){
    int T;
    while(~scanf("%d",&T)){
        while(T--){
            scanf("%s",s);
            scanf("%s",s1);
            Kmp();
        }
    }
    return 0;
}