Submission #893358

#	Time	Username	Problem	Language	Result	Execution time	Memory
893358		vjudge1	Event Hopping 2 (JOI21_event2)	C++17	0 / 100	25 ms	6960 KiB

event2

#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define endl "\n"
#define ll long long
#define int ll
int E,B;
void fopn(string name){
    freopen((name+".in").c_str(),"r",stdin);
    freopen((name+".out").c_str(),"w",stdout);
}
const ll N=5e5+5,INF=1e18,mod=1e9+7;
void solve(){
	int n,k;cin>>n>>k;
	vector<pair<pair<int,int>,int>> vec;
	for(int i=0;i<n;i++){
		int a,b;cin>>a>>b;vec.pb({{b,a},i});
	}
	sort(all(vec));
	int cur=0,ans=0;
	vector<int> res;
	for(auto it: vec){
		if(it.fr.sc>=cur){
			cur=it.fr.fr;
			res.pb(it.sc);
			ans++;
		}
	}
	if(k>(int)res.size()) cout<<-1;
	else{
		sort(all(res));
		for(int i=0;i<k;i++) cout<<res[i]+1<<endl;
	}
	//cout<<ans;
}
main(){
	B=clock();
    ios;
    int T=1;
	//cin>>T;
    for(int i=1;i<=T;i++){
        //cout<<"Case #"<<i<<": ";
        solve();
    }
    E=clock();
    cerr<<"\n\n\n\nTIME: "<<((float)E-B)/CLOCKS_PER_SEC<<" SECONDS";
}

Compilation message (stderr)

event2.cpp:41:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   41 | main(){
      | ^~~~
event2.cpp: In function 'void fopn(std::string)':
event2.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen((name+".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event2.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((name+".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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