http://www.cnblogs.com/mfryf/archive/2012/08/15/2639565.html

problem：http://acm.hdu.edu.cn/showproblem.php?pid=2087

kmp计数 

#include <bits/stdc++.h>
using namespace std;
#define maxn 1010
char str[maxn],son[maxn];
int nxt[maxn];
void init(int len)
{
    int i = 0, j = -1;
    nxt[0] = -1;
    while (i < len )
    {
        if (j == -1 ||son[i] == son[j])
        {
            i++;
            j++;
            nxt[i] = j;
        }
        else
            j = nxt[j];
    }
}
void  kmp()
{
    int i = 0, j = 0, ans = 0;
    int lt = strlen(str), lp = strlen(son);
    init(lp);
    while (i < lt)
    {
        if (j == -1 || str[i] == son[j])
        {
            i++;
            j++;
        }
        else
            j = nxt[j];
        if (j ==lp)
        {
            ans++;
            j = 0;
        }
    }
    printf("%d\n", ans);
}

int main()
{
    while (scanf("%s%s", str, son) == 2)
    {
        kmp();
    }
    return 0;
}