Submission #381333

#	Time	Username	Problem	Language	Result	Execution time	Memory
381333		NONAME	Zagrade (COI20_zagrade)	C++17	100 / 100	982 ms	1376 KiB

zagrade

#include <bits/stdc++.h>
using namespace std;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
template <typename T> inline bool chmin(T& a, const T b) {a = min(a, b); return (a == b);}
template <typename T> inline bool chmax(T& a, const T b) {a = max(a, b); return (a == b);}

int n, q;
string s;
vector <int> vc;

inline void cls() {}

int ask(int x, int y) {
    cout << "? " << (x + 1) << " " << (y + 1) << endl;
    cin >> x;
    return x;
}

void solve() {
    cls();

    cin >> n >> q;
    for (int i = 0; i < n; ++i) {
        s += '?';
    }

    for (int i = 0; i < n; ++i) {
        if (vc.empty()) {
            vc.push_back(i);
        } else {
            int x = ask(vc.back(), i);

            if (x) {
                s[vc.back()] = '(';
                s[i] = ')';
                vc.pop_back();
            } else {
                vc.push_back(i);
            }
        }
    }

    int cnt = 0;
    for (int i = 0; i < n; ++i) {
        cnt += (s[i] == '?');
    }

    assert(!(cnt & 1));

    int cl = (cnt >> 1);
    for (int i = 0; i < n; ++i) {
        if (s[i] == '?') {
            if (cl) {
                --cl;
                s[i] = ')';
            } else {
                s[i] = '(';
            }
        }
    }

    cout << "! " << s << "\n";
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

//    int t = 1;
    #ifdef _LOCAL
        system("color a");
//        freopen("in.txt", "r", stdin);
//        cin >> t;
    #endif

//    for (int i = 1; i <= t; ++i) {
//        cerr << "Case #" << i << ": \n";
        solve();
//        cerr << "\n";
//    }

    return 0;
}

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