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;
bool ask (int a, int b) {
cout << "? " << a << " " << b << endl;
int ans;
cin >> ans;
return ans;
}
int main () {
int n, Q;
cin >> n >> Q;
vector <int> unpaired (1, 1);
vector <char> sol (n + 1);
for (int i = 2; i <= n; i++) {
if (unpaired.size () && ask (unpaired.back (), i)) {
sol[unpaired.back ()] = '(';
sol[i] = ')';
unpaired.pop_back ();
}
else {
unpaired.push_back (i);
}
}
int sz = unpaired.size ();
for (int i = sz / 2 + 1; i < sz; i++)
sol[unpaired[i]] = ')';
for (int i = 0; i < sz / 2; i++)
sol[unpaired[i]] = '(';
cout << "! ";
for (int i = 1; i <= n; i++)
cout << sol[i];
cout << endl;
return 0;
}
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