KMP(HDU1711)

#include <stdio.h>

#define MAXMSLEN 1000000
#define MAXTSLEN 10000
int ms_len, ts_len;
int ms[MAXMSLEN], ts[MAXTSLEN], next[MAXTSLEN];

void GetNext(void)
{
    int i, j;
    i = 0;
    next[0] = j = -1;
    while(i < ts_len)
    {
        if(j == -1 || ts[i] == ts[j])
        {
            ++i;
            ++j;
            if(ts[i] != ts[j])
                next[i] = j;
            else
                next[i] = next[j];
        }
        else
            j = next[j];
    }
}

int KMP(void)
{
    int i, j;
    i = j = 0;
    while(i < ms_len && j < ts_len)
    {
        if(j == -1 || ms[i] == ts[j])
        {
            ++i;
            ++j;
        }
        else
            j = next[j];
    }
    if(j == ts_len)
        return i - ts_len + 1;
    else
        return -1;
}

int main(void)
{
    int i, t;
    scanf("%d", &t);
    while(t--)
    {
        scanf("%d %d", &ms_len, &ts_len);
        for(i = 0; i < ms_len; ++i)
            scanf("%d", &ms[i]);
        for(i = 0; i < ts_len; ++i)
            scanf("%d", &ts[i]);
        GetNext();
        printf("%d\n", KMP());
    }
    return 0;
}