二、阅读程序-1

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#include <iostream> 
#include <string> 
#include <vector> 
 
using namespace std; 
  
 int f(const string &s, const string &t) 
  { 
      int n = s.length(), m = t.length(); 
 
     vector<int> shift(128, m + 1); 
 
     int i, j;
 
     for (j = 0; j < m; j++)
         shift[t[j]] = m - j;
 
     for (i =0; i<= n - m; i += shift[s[i + m]]){
         j =0;
         while(j < m && s[i +j] == t[j]) j++;
         if (j == m) return i;
     }
 
     return -1;
 }
 
 int main()
 {
     string a ,b;
     cin >> a >> b;
     cout << f(a, b) << endl;
     return 0;
 }