백준 4344번

원본 : www.acmicpc.net/problem/4344

4344번: 평균은 넘겠지

 

풀이

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {

	public static void main(String[] args) throws Exception {
		
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));
		
		int n = Integer.parseInt(reader.readLine());
		String str[] = new String[n];
		
		for (int i = 0; i < n; i++) {
			str[i] = reader.readLine();
		}
		
		for (int i = 0; i < n; i++) {
			writer.write(String.format("%.3f", calculate(str[i])) + "%");
			writer.newLine();
		}
		
		writer.flush();
	}
	
	public static double calculate(String str) {
		int arr[] = new int[Integer.parseInt(str.split(" ")[0])];
		
		int sum = 0;
		for (int i = 0; i < arr.length; i++) {
			arr[i] = Integer.parseInt(str.split(" ")[i + 1]);
			sum += arr[i];
		}
		double avg = (double)sum / (double)arr.length;
		
		int count = 0;
		for (int i = 0; i < arr.length; i++) {
			if (arr[i] > avg) {
				count++;
			}
		}
		
		return (double)count / (double)arr.length * 100.0;
	}

}