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
#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 n;
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 q;
cin >> n >> q;
vector<int> ans(n,0);
int antok = -inf;
int pos = 0;
int qtd = n/2;
set<int> ids;
for(int i = 0; i < n; i++) ids.insert(i);
for(int r = 1; r < n; r++) {
auto it = ids.find(r);
if(it == ids.begin()) continue;
it = prev(it);
int l = *it;
if(query(l,r)) {
ans[l] = +1;
ans[r] = -1;
ids.erase(l);
ids.erase(r);
}
}
// while(pos+1 < n) {
// int l = pos+1;
// int r = pos;
// while(l-1 > antok && query(l-1,r+1)) {
// l--;
// r++;
// ans[l] = +1;
// ans[r] = -1;
// qtd--;
// }
// if(l <= r) antok = r;
// 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 (stderr)
zagrade.cpp: In function 'int32_t main()':
zagrade.cpp:30:6: warning: unused variable 'antok' [-Wunused-variable]
30 | int antok = -inf;
| ^~~~~
zagrade.cpp:31:6: warning: unused variable 'pos' [-Wunused-variable]
31 | int pos = 0;
| ^~~
zagrade.cpp:32:6: warning: unused variable 'qtd' [-Wunused-variable]
32 | int qtd = n/2;
| ^~~
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