#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define all(x) x.begin(),x.end()
const int maxn = 5e5+10;
const int inf = 1e18+10;
int query(int l, int r) {
if(l > r) return 0;
if(l < 0 or r >= n) return 0;
cout << "? " << l+1 << " " << r+1 << endl;
cout.flush();
int x; cin >> x;
return x;
}
int32_t main() {
// #ifndef ONLINE_JUDGE
// freopen("in.in","r",stdin);
// freopen("out.out","w",stdout);
// #endif
int n, q;
cin >> n >> q;
vector<int> ans(n,0);
int antok = -inf;
int pos = 0;
int qtd = n/2;
while(pos+1 < n) {
int l = pos+1;
int r = pos;
while(query(l-1,r+1)) {
l--;
r++;
ans[l] = +1;
ans[r] = -1;
qtd--;
}
pos = r+1;
}
for(int i = 0; i < n; i++) {
if(ans[i] == 0) {
if(qtd == 0) {
ans[i] = +1;
}
else {
qtd--;
ans[i] = -1;
}
}
}
cout << "! ";
for(int i = 0; i < n; i++) {
if(ans[i] == -1) cout << ')';
else cout << '(';
}
cout.flush();
}
Compilation message
zagrade.cpp: In function 'long long int query(long long int, long long int)':
zagrade.cpp:14:19: error: 'n' was not declared in this scope
14 | if(l < 0 or r >= n) return 0;
| ^
zagrade.cpp: In function 'int32_t main()':
zagrade.cpp:30:6: warning: unused variable 'antok' [-Wunused-variable]
30 | int antok = -inf;
| ^~~~~
