Submission #1227333

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <math.h>
#include <string>
#include <string.h>
#include <stack>
#include <queue>
#include <vector>
#include <utility>
#include <set>
#include <map>
#include <stdlib.h>
#include <iomanip>

using namespace std;

#define ll long long
#define vi vector<int>
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back
#define pi 3.14159265359


int main() {
	int N, K;
	int R[100];
	long double sum = 0;
	cin >> N >> K;
	REP(i, N) {
		cin >> R[i];
	}
	sort(R,R+N);
	FOR(i,N-K, N) {
		sum = (sum + R[i]) / 2;
	}
	cout << fixed << setprecision(6) << sum << endl;
	cin >> N;
	return 0;
}

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