Submission #893525

#	Time	Username	Problem	Language	Result	Execution time	Memory
893525		vjudge1	Event Hopping 2 (JOI21_event2)	C++17	0 / 100	22 ms	3288 KiB

event2

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define int long long
#define pb push_back
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define ordered_set tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update>
#define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
using namespace __gnu_pbds;

const int mod = 998244353;
const double PI = acos(-1.0);
const double epsilon = 1e-6;

void solve(){
	int n,k;
	cin >> n >> k;
	pair<int,int> a[n+1];
	for(int i = 1; i <= n; i++){
		int l, r;
		cin >> l >> r;
		a[i] = {r, l};
	}
	sort(a + 1, a + 1 + n);
	int last = 0;
	vector<int> ans;
	for(int i = 1; i <= n; i++){
		int l = a[i].ss;
		int r = a[i].ff;
		if(last <= l){
			last = r;
			ans.pb(i);
		}
	}
	if((int)ans.size() < k){
		cout << "-1\n";
		return;
	}
	for(int i = 0; i < k; i++) cout << ans[i] << '\n';
}

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

    int tt = 1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
}

Compilation message (stderr)

event2.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main(){
      | ^~~~

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