Submission #929841

#	Time	Username	Problem	Language	Result	Execution time	Memory
929841		Pannda	Event Hopping 2 (JOI21_event2)	C++17	1 / 100	74 ms	1504 KiB

event2

#include <bits/stdc++.h>
using namespace std;

const int INF = 1e9 + 12345;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, k;
    cin >> n >> k;

    vector<array<int, 2>> a(n);
    for (int i = 0; i < n; i++) {
        int l, r;
        cin >> l >> r;
        a[i] = {l, r};
    }

    vector<int> key(k, INF);
    for (int mask = 0; mask < (1 << n); mask++) {
        if (__builtin_popcount(mask) != k) continue;
        vector<int> seq;
        vector<array<int, 2>> fetch;
        for (int i = 0; i < n; i++) {
            if (mask >> i & 1) {
                seq.push_back(i);
                fetch.push_back(a[i]);
            }
        }
        sort(fetch.begin(), fetch.end());
        bool ok = true;
        for (int i = 1; i < k; i++) {
            if (fetch[i][0] < fetch[i - 1][1]) {
                ok = false;
            }
        }
        if (ok) {
            key = min(key, seq);
        }
    }

    if (key[0] == INF) {
        cout << -1 << '\n';
    } else {
        for (int i : key) {
            cout << i + 1 << '\n';
        }
    }
}

• Subtask 1: 0 / 7
• Subtask 2: 1 / 1
• Subtask 3: 0 / 31
• Subtask 4: 0 / 61