func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int tt = 1;     while (tt--) {       int n;       cin >> n;       int a[n - 1];       cout <<  ? 2 3  << endl << endl;       int m;       cin >> m;       for (int i = 0; i < n - 1; i++) {         cout <<  ?   << 1 <<     << i + 2 << endl << endl;         cin >> a[i];       }       int b[n];       for (int i = 2; i < n; i++) b[i] = a[i - 1] - a[i - 2];       b[1] = m - b[2];       b[0] = a[0] - b[1];       cout <<  !  ;       for (int i = 0; i < n; i++) cout << b[i] <<    ;       cout << endl;     }     return 0;   }   