func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1e4 + 100;   const long long inf = 0x3f3f3f3f3f;   int n;   int a[maxn];   int main() {     cin >> n;     for (int i = 1; i <= n; i++) {       if (i != n) {         int q;         cout <<  ?               <<   1               <<     << i + 1 << endl;         cin >> q;         a[i + 1] = q;       } else {         int q;         cout <<  ?               <<                  <<  2               <<     << 3 << endl;         cin >> q;         a[1] = (a[2] + a[3] - q) / 2;       }     }     cout <<  !  ;     for (int i = 1; i <= n; i++) {       if (i == 1)         cout << a[1] <<    ;       else         cout << a[i] - a[1] <<    ;     }   }   