[백준] 21146 Rating Problems - Greedy / Java

• 문제 링크

21146번: Rating Problems

 

• 풀이 코드

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        int n = read(), k = read();

        float sum = 0;
        for (int i = 0; i < k; i++) sum += read();

        bw.write((sum + -3 * (n - k)) / n + " " + (sum + 3 * (n - k)) / n);
        bw.flush();
    }

    private static int read() throws IOException {
        int c, n = System.in.read() & 15;
        boolean flag = n == 13;

        if (flag) n = System.in.read() & 15;
        while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);

        return flag ? ~n + 1 : n;
    }

}