#include <bits/stdc++.h> using namespace std; void setup() { #ifndef ONLINE_JUDGE freopen("test.inp", "r", stdin); freopen("test.out", "w", stdout); #endif ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); } int n, k; pair<int, int> p[20]; bool cut[20][20]; inline void Form(int ind, int num, int bit) { bool check = true; if (num == k) { for (int i = 0; i < n; ++i) { if ((bit >> i) & 1) { cout << i + 1 << "\n"; } } exit(0); } if (num + n - ind < k) { return; } for (int i = 0; i < n; ++i) { if (ind != i && ((bit >> i) & 1) && cut[ind][i]) { check = false; break; } } if (check) { Form(ind + 1, num + 1, bit + (1 << ind)); } Form(ind + 1, num, bit); } int main() { // setup(); cin >> n >> k; for (int i = 0; i < n; ++i) { cin >> p[i].first >> p[i].second; } for (int i = 0; i < n; ++i) { for (int j = 0; j < n; ++j) { cut[i][j] = !((p[i].second <= p[j].first || p[j].second <= p[i].first)); } } Form(0, 0, 0); cout << -1; return 0; }

event2.cpp: In function 'void setup()':
event2.cpp:8:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     freopen("test.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
event2.cpp:9:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     freopen("test.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~