86求调

#include<bits/stdc++.h>
using namespace std;
double a[10009],d,ans;
int n,k;
bool check(double s)
{
	int z=0;
	for(int i=1;i<=n;i++)
		z+=(int)a[i]/s;
	return z>=k;
}
int main()
{
	cin>>n>>k;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
		d=max(d,a[i]);
	}
	double l=0,r=d;
	while(l+0.01<r)
	{
		double mid=(l+r)/2.0;
		if(mid==0)break;
		if(check(mid)){l=mid;ans=mid;}
		else r=mid;
	}
	cout<<fixed<<setprecision(2)<<ans;
	return 0;
}