char p[maxn], t[maxn];
void get(void)  
{  
	int i, j;  
    next[0] = next[1] = 0;  
    for(i = 1; i <= m; i++) {  
        j = next[i];  
        while(j && p[i] != p[j]) j=next[j];  
        next[i+1] = p[i]==p[j] ? j+1 : 0;  
    }  
}  
bool kmp(void)  
{  
    int i, j;  
    for(i = 0, j = 0; i <= lengh; i++) {  
        while(j && t[i] != p[j]) j=next[j];  
        if(t[i] == p[j]) j++;  
        if(j == m) return true;
    }
	return false;
}