【LGR-197-Div.2】洛谷 10 月月赛 I &「SFMOI」Round I

#include<bits/stdc++.h>
using namespace std;
unsigned long long t,a,b;
int main() {
    cin>>t;
    while(t--){
    	cout.flush();
        cout<<"? "<<"399999999"<<endl;
        cout.flush();
        cin>>a;
        if(a==-1) return 0;
        cout<<"? "<<"399999998"<<endl;
        cout.flush();
        cin>>b;
        if(b==-1) return 0;
        if(a>b) cout<<"! "<<(399999999-a)*399999998+b<<endl;
        else cout<<"! "<<(b-a)*399999999+a<<endl;
    }
    return 0;
}
/*100000000000000000
*/