func_code_string: #include <bits/stdc++.h>   using namespace std;   using u128 = __uint128_t;   signed main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     long long t = 1;     while (t--) {       long long n;       cin >> n;       vector<long long> ans(n, 0);       cout <<  ?   << 1 <<     << n << endl;       long long tot;       cin >> tot;       for (long long i = 2; i < n; i++) {         cout <<  ?   << i <<     << n << endl;         long long q;         cin >> q;         ans[i - 2] = tot - q;         tot = q;       }       cout <<  ?   << n - 2 <<     << n - 1 << endl;       long long q;       cin >> q;       ans[n - 2] = q - ans[n - 3];       ans[n - 1] = tot - ans[n - 2];       cout <<  !  ;       for (long long i : ans) cout << i <<    ;       exit(0);     }     return 0;   }   