Submission #921502

#	Time	Username	Problem	Language	Result	Execution time	Memory
921502		PM1	Sure Bet (CEOI17_sure)	C++17	0 / 100	15 ms	2524 KiB

sure

#include <bits/stdc++.h>
using namespace std;
const int mxn=1e5+5;
int n;
long double a[mxn],b[mxn];
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++)
		cin>>a[i]>>b[i];
	sort(a+1,a+n+1);
	sort(b+1,b+n+1);
	long double L=0,R=1e9;
	int t=200;
	while(R-L>0.0001){
		long double mid=(L+R)/2,sum1=0,sum2=0;
		int p=n;
		for(int i=n;i>0;i--){
			while(p>0 && sum2<mid){
				sum2+=b[p]-1;
				p++;
				sum1-=1;
			}
			if(sum1>=mid)break;
			sum1+=a[i]-1;
			sum2-=1;
		}
		if(sum1>=mid && sum2>=mid)
			L=mid;
		else
			R=mid;
	}
	cout<<fixed<<setprecision(4);
	cout<<L<<endl;
	return 0;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:16:6: warning: unused variable 't' [-Wunused-variable]
   16 |  int t=200;
      |      ^

• Subtask 1: 0 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40