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;
#define int long long
typedef pair<int,int> pi;
#define f first
#define s second
#define FAST ios_base::sync_with_stdio(0); cin.tie(0);
#define all(x) x.begin(),x.end()
const int maxn = 100010;
const int INF = LLONG_MAX/2;
const int mod = 1e9+7;
// string s = ")(())(()))((()";
bool check(int a, int b) {
// int co = 0;
// cout << a << " " << b << " ";
// for (int i = a; i <= b;i++) {
// if (s[i-1] == '(') co += 1;
// else co -= 1;
// if (co < 0) {
// cout << "0\n";
// return false;
// }
// }
// if (co == 0) {
// cout << "1\n";
// return true;
// } else {
// cout << "0\n";
// return false;
// }
cout << "? " << a << " " << b << "\n";
cout.flush();
int x; cin >> x;
return x;
}
int32_t main() {
FAST
// ifstream cin("input.txt");
int n, Q; cin >> n >> Q;
stack <int> S;
S.push(1);
vector <int> ans(n+1, 0);
for (int i =2;i<=n;i++) {
if (!S.empty() and check(S.top(), i)) {
ans[S.top()] = 1;
ans[i] = 2;
S.pop();
} else {
S.push(i);
}
}
int left = S.size();
for (int i =0;i<left/2;i++) {
ans[S.top()] = 1; S.pop();
}
for (int i =0;i<left/2;i++) {
ans[S.top()] = 2; S.pop();
}
cout << "! ";
for (int i =1;i<=n;i++) {
if (ans[i] == 1) cout << '(';
else cout << ')';
}
}
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