Submission #1187613

#	Time	Username	Problem	Language	Result	Execution time	Memory
1187613		PieArmy	Sure Bet (CEOI17_sure)	C++20	100 / 100	44 ms	1864 KiB

sure

#include<bits/stdc++.h>
typedef long long ll;
#define pb push_back
#define fr first
#define sc second
#define endl '\n'
using namespace std;

int n;
double a[100023],b[100023];

int main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i];
	}
	sort(a+1,a+n+1,[&](const double&x,const double&y){return x>y;});
	sort(b+1,b+n+1,[&](const double&x,const double&y){return x>y;});
	int l=1,r=1;
	double sum1=0,sum2=0;
	double ans=0;
	for(int i=1;i<=2*n;i++){
		if(l>n||(r<=n&&sum1>sum2)){
			sum2+=b[r++];
		}
		else if(r>n||(l<=n&&sum1<=sum2)){
			sum1+=a[l++];
		}
		ans=max(ans,min(sum1,sum2)-double(i));
	}
	printf("%.4lf",ans);
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40