제출 #725260

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
725260		Baytoro	Pairs (IOI07_pairs)	C++17	30 / 100	24 ms	1992 KiB

pairs

#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 long long
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const ll INF=1e18,mod=1e9+9,N=1e5+5;
void solve(){
	int b,n,d,m;
	cin>>b>>n>>d>>m;
	if(b==1){
		vector<int> a(n);
		for(int i=0;i<n;i++) cin>>a[i];
		sort(all(a));
		int ans=0;
		for(int i=0;i<n;i++){
			int j=upper_bound(all(a),a[i]+d)-a.begin();
			ans+=j-i-1;
		}
		cout<<ans<<endl;
	}
	else{
		cout<<-1;
	}
}
main(){
	//fopn("team");
	ios;
	int T=1;
	//cin>>T;
	for(int i=1;i<=T;i++){
		//cout<<"Case #"<<i<<": ";
		solve();
	}
}

컴파일 시 표준 에러 (stderr) 메시지

pairs.cpp:35:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   35 | main(){
      | ^~~~
pairs.cpp: In function 'void fopn(std::string)':
pairs.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pairs.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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