h.cpp

#include <bits/stdc++.h>
using namespace std;
//
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mx 100010
#define mod 1000000007
#define inf INT_MAX
#define pi acos(-1)
#define endl '\n'
#define fin freopen("input", "r", stdin)
#define Fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
//
int main() {
    ll n;
    cin >> n;
    ll ar[n];

    ll x, y, z;
    cout << "? 1 2" << endl;
    cout.flush();
    cin >> x;
    cout << "? 2 3" << endl;
    cout.flush();
    cin >> y;
    cout << "? 1 3" << endl;
    cout.flush();
    cin >> z;

    ar[0] = (x + z - y) / 2;
    ar[1] = x - ar[0];
    ar[2] = z - ar[0];

    for (ll i = 4; i <= n; i++) {
        cout << "? " << 1 << " " << i << endl;
        cout.flush();
        cin >> x;
        ar[i - 1] = x - ar[0];
    }

    cout << "! ";
    cout.flush();
    for (ll i = 0; i < n; i++) {
        cout << ar[i] << " ";
        cout.flush();
    }
}