제출 #1319583

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1319583		Faisal_Saqib	Let's Win the Election (JOI22_ho_t3)	C++20	0 / 100	3 ms	332 KiB

Main

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
#define ld long double
main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n,k;
	cin>>n>>k;
	bool use[n+2]={0};
	pair<ld,ld> c[n+2];
	pair<ld,int> a[n+2],b[n+2];
	for(int i=0;i<n;i++)
	{
		cin>>a[i].first>>b[i].first;
		if(b[i].first==-1)b[i].first=1e18;
		a[i].second=i;
		b[i].second=i;
		c[i].first=-a[i].first+b[i].first;
		c[i].second=b[i].first;
	}
	sort(c,c+n);
// 	cout<<"order "<<endl;
	for(int i=0;i<n;i++)
	{
		b[i].first=c[i].second;
		// b[i].first=c[i].first+c[i].second;
		a[i].first=c[i].second-c[i].first;
		// cout<<a[i].first<<' '<<b[i].first<<' '<<b[i].first-a[i].first<<endl;;
	}
// 	cout<<endl;
	cout.precision(4);
	sort(a,a+n);
	// sort(b,b+n);
	// for(int i=0;i<n;i++)
	// {
		// b[i].first-=c[b[i].second].second;
	// }
	ld ot=0,cst=0;
	ld ans=1e18;
	vector<int> allp;
	for(int i=0;i<=n and ot<=k;i++)
	{
	  sort(begin(allp),end(allp));
	  cst=0;
	  for(int i=1;i<=ot;i++)
	  {
      	    cst+=(allp[i-1]/(ld)i);
	  }
		ld tmp=0,tot=ot;
		for(int i=0;i<n and tot<k;i++)
		{
			if(!use[a[i].second])
			{
				tmp+=a[i].first;
				// cout<<"used "<<a[i].second<<endl;
				tot++;
			}
		}
		ans=min(ans,(tmp/(ot+1))+cst);
		// cout<<"Taken "<<ot<<' '<<tmp<<' '<<cst<<' '<<(tmp/(ot+1))+cst<<endl;
		if(i<n)
		{
			ot++;
			use[b[i].second]=1;
			allp.push_back(b[i].first);
		// 	cst+=(b[i].first/ot);
		// 	cout<<"Taking "<<b[i].second<<endl;
		}
	}
	cout<<fixed<<ans<<endl;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp:6:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    6 | main()
      | ^~~~

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