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;
const int nx=1e5+5;
int n, res[nx], x, q;
int query(int l, int r)
{
cout<<"? "<<l<<' '<<r<<'\n';
fflush(stdout);
cin>>x;
return x;
}
void solve(int l, int r)
{
if (r<l) return;
if (r==l+1) return res[l]=1, void();
for (int i=l+1; i<r; i++) if (((i-l+1)%2)==0&&query(l, i)) return solve(l, i), solve(i+1, r), void();
res[l]=1;
solve(l+1, r-1);
}
int main()
{
cin>>n>>q;
solve(1, n);
cout<<"! ";
for (int i=1; i<=n;i ++) cout<<(res[i]?'(':')');
}
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