pku3461 Oulipo （KMP）

比较裸的KMP

#include<iostream>
#include<algorithm>
using namespace std;
int n,m;
char T[1000010],P[10010];
int nxt[10010];
int KMP()
{
    nxt[0] = -1;
    int k = -1;
    for(int q=1;q<=m-1;q++){
        while (k > -1 && P[k+1] != P[q])
            k = nxt[k];
        if (P[k+1] == P[q]) ++k;
        nxt[q] = k;
    }
    int pos = -1;
    int j = -1,i = 0,count = 0;
    while (i < n) {
        while (j > -1 && P[j+1] != T[i])
            j = nxt[j];
        if (P[j+1] == T[i]) ++j;
        if (j+1 == m) {
            count++;
            j = nxt[j];
        }
        ++i;
    }
    return count;
}
int main()
{
	int cas;
	scanf("%d",&cas);
	while(cas--)
	{
		scanf("%s %s",P,T);
		n=strlen(T);
		m=strlen(P);
		printf("%d\n",KMP());
	}
	return 0;
}