func_code_string: #include <bits/stdc++.h>   using namespace std;   bool found = false;   int b, A[10000], orig_a;   int main() {     int a, b[3], i, j, n, x, y, z, array[100000];     cin >> n;     for (i = 0; i < 3; i++) {       if (i <= 1) {         cout <<  ?   << 1 <<     << i + 2 << endl;       } else {         cout <<  ?   << 2 <<     << 3 << endl;       }       fflush(stdout);       cin >> b[i];     }     z = -(b[0] - b[1] - b[2]) / 2;     y = b[2] - z;     x = b[0] - y;     array[0] = x;     array[1] = y;     array[2] = z;     for (i = 4; i <= n; i++) {       cout <<  ?   << 1 <<     << i << endl;       fflush(stdout);       cin >> a;       array[i - 1] = a - x;     }     cout <<  ! ;     for (i = 0; i < n; i++) {       cout <<     << array[i];     }     cout << endl;     return 0;   }   