func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 1e3 + 5;   const int INF = 0x3f3f3f3f;   const int MOD = 1e3;   int ans[MAXN];   char s[MAXN];   void solve() {     int n;     cin >> n;     int k, num;     int s12, s13, s23;     cout <<  ?   << 1 <<     << 2 << endl;     scanf( %d , &s12);     cout <<  ?   << 1 <<     << 3 << endl;     scanf( %d , &s13);     cout <<  ?   << 2 <<     << 3 << endl;     scanf( %d , &s23);     ans[1] = s13 - s23;     ans[2] = s12 - ans[1];     ans[3] = s13 - ans[1] - ans[2];     for (int i = 4; i <= n; i++) {       cout <<  ?   << i - 1 <<     << i << endl;       scanf( %d , &ans[i]);       ans[i] = ans[i] - ans[i - 1];     }     cout <<  !   << ans[1] << flush;     for (int i = 2; i <= n; i++) {       cout <<     << ans[i] << flush;     }     cout << endl;     return;   }   int main() {     solve();     return 0;   }   