Submission #123248

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Source Code Expand

#include<iostream>
#include<algorithm>
#include<stdio.h>
using namespace std;

int main()
{
	int N, K;
	cin >> N >> K;
	
	int rate[N];
	for(int i = 0; i < N; i++){
		cin >> rate[i];
	}

	sort(rate, rate + N);

	double Trate = 0.0;
	for(int i = 0; i < K; i++){
		if(K == N)	Trate = (Trate + rate[i]) / 2.0;
		else	Trate = (Trate + rate[K + i]) / 2.0;
	}

	printf("%.6f\n", Trate);

	return 0;
}

Submission Info

Judge Result