Submission #1517912

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <functional>

using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define VI vector<int>
#define debug(x) cout<<#x<<": "<<x<<endl
#define DEBUG(x) cout<<#x<<": "<<x<<endl
int N,K;
vector <int > R;





int main()
{

	cin >> N >> K;

	R.resize(N);

	REP(i,N){
		cin >> R[i];
	}

	sort(R.begin(),R.end());

	double ans = 0;
	FOR(i,N-K,N){
		ans = (ans+R[i])/2;
	}
	cout << fixed << ans << endl;
}

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