제출 #570865

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
570865		duytuandao21	Sure Bet (CEOI17_sure)	C++17	0 / 100	1 ms	212 KiB

sure

#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
const int N = 2e6+7;
int n;
double a[N], b[N], prefixSumA[N], prefixSumB[N], res = 0;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++) cin>>a[i]>>b[i];
	sort(a+1,a+1+n,greater<double>());
	sort(b+1,b+1+n,greater<double>());
	for(int i=1;i<=n;i++) {
		prefixSumA[i] = prefixSumA[i-1] + a[i];
		prefixSumB[i] = prefixSumB[i-1] + b[i];
 
	}
	//for(int i=1;i<=n;i++) cout<<prefixSumA[i]<<" "<<prefixSumB[i]<<'\n';
	for(int i=1;i<=2*n;i++) {
		int l = 0;
		int r = min(i,n);
		//double ans = 0;
		while(l <= r) {
			int mid = (l+r)/2;
			double va1 = prefixSumA[mid];
			double va2 = prefixSumB[i-mid];
			res = max(res, min(va1 - i, va2 - i));
			//ans = max(ans, min(va1 - i, va2 - i));
			if(va1 - i < va2 - i) l = mid + 1; else r = mid - 1;
		}
		//cout<<ans<<" ";
	}
	printf("%.4lf",(double)res);
	return 0;
}

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• Subtask 3: 0 / 40