#include <iostream>
#include<string>
using namespace std;
void preMp(const char * x, int m, int * ps) {
    int i, j;
    i = 0;
    j = ps[0] = -1;
    //cout << ps[0]<<x<<m;   //m= 2
    //cout << x[i] << x[j];
    while (i < m) {
        while (j > -1 && x[i] != x[j])
            j = ps[j];
        ps[++i] = ++j;
        //cout << ps[i] << i;
    }
}

void MP(string p, string t) {
    int m = p.length();
    int n = t.length();
    //cout << m << n;
    if (m > n) {
        cerr << "Unsuccessful match!" << endl;
        return;
    }
    const char * x = p.c_str();  //c_str()函数返回一个指向正规C字符串的指针, 内容与本string串相同. 
    const char * y = t.c_str();
    //cout << x << y;  x= hk, m = 2;
    int i = 0, j = 0;
    int*  ps = new int [m+1];
    //cout << sizeof(ps);
    preMp(x, m, ps);

    //cout << i;// j<<ps[1];
    //cout << ps[3];
    while (j < n) {
        while (i > -1 && x[i] != y[j])
             i = ps[i];
        i +=1;
        j++;
        //cout << i;
        if (i >= m) {
            cout << "Matching index found at : " << j - i +1<< endl;
        }
    }
}
int main()
{
    void MP(string t, string p);
    string p;
    string t;
    cout << "输入两个字符串用空格分开，判断字符串1在字符串2中起始的位置\n";
    cin >> t;
    cin >> p;
    MP(t, p);
    return 0;
}