This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
vector<int> v;
stack<int> st;
int main(){
int n,q; cin>>n>>q;
v.resize(n+5);
st.push(1); v[1] = 1;
for(int i = 2; i <= n; i++){
cout<<"? "<<st.top()<<" "<<i<<endl;
int x; cin>>x;
if(x == 0){
v[i] = 1;
st.push(i);
}else{
v[i] = 0;
st.pop();
}
}
cout<<"! ";
for(int i = 1; i <= n; i++){
if(v[i] == 0)cout<<")";
else cout<<"(";
}cout<<endl;
return 0;
}
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