Submission #6414413

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#define _USE_MATH_DEFINES
#include <math.h>
#include <iomanip>
#include <stdio.h>
#include <numeric>
#include <cmath>
#include <limits>
#include <bitset> 
#include <iterator> 
using namespace std;
long long divisorNum(long long);
long long kaijou(long long);

int main()
{
	double n, k, ans=0;
	cin >> n >> k;
	vector<double>r(n);
	for (double& x : r)cin >> x;
	sort(r.begin(), r.end());
	for (int i = n-k; i < n; i++) {
		ans = (ans + r[i]) * 0.5;
	}
	cout << fixed << setprecision(10) << ans << endl;
}

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