Submission #1263174

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263174		goulthen	Zagrade (COI20_zagrade)	C++20	100 / 100	233 ms	1640 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define per(i, b, a) for (int i = b; i >= a; --i)
#define pb push_back
#define all(v) (v).begin(), (v).end()
 
const int MAXN = 2e5 + 10;
const int INF = 1e18 + 5;
const int MOD = 1e9 + 7;

int query(int l, int r) {
    int ans;
    cout << "? " << l << " " << r << endl;
    cin >> ans;
    return ans;
}

int32_t main() {
    int n,q;cin >> n >> q;

    char pfx[n+10] = {};

    vector<int> idx;
    rep(i,1,n) {
    	if (idx.empty()) {
    		idx.pb(i);
    		continue;
    	}

    	int x = query(idx.back(),i);
    	if (x == 1) {
    		pfx[idx.back()] = '(';
    		pfx[i] = ')';
    		idx.pop_back();
    	} else {
    		idx.pb(i);
    	}
    }
    rep(i,0,(int)idx.size()-1) pfx[idx[i]] = (i < idx.size()/2 ? ')' : '(');


    cout << "! ";
    rep(i,1,n) cout << pfx[i];
    cout << endl;

	return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 7 / 7
• Subtask 3: 57 / 57
• Subtask 4: 22 / 22