func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     cout <<  ?   << 1 <<     << 3 << endl;     int ac;     cin >> ac;     cout <<  ?   << 1 <<     << 2 << endl;     int ab;     cin >> ab;     cout <<  ?   << 2 <<     << 3 << endl;     int bc;     cin >> bc;     int amc = ab - bc;     int a2 = ac + amc;     int a = a2 / 2;     int b = ab - a;     int c = bc - b;     vector<int> res = {a, b, c};     for (int i = 0; i < n - 3; i++) {       cout <<  ?   << 1 <<     << i + 4 << endl;       int tmp;       cin >> tmp;       res.push_back(tmp - a);     }     cout <<  !  ;     for (int val : res) cout << val <<    ;     cout << endl;   }   