[백준] 34845 강의평 - Brute Force / Java

• 문제 링크

https://www.acmicpc.net/problem/34845

 

• 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(), x = read(), sum = 0;
        for (int i = 0; i < n; i++) sum += read();

        int avg = sum / n, cnt = 0;
        while (avg < x) avg = (sum += 100) / (n + ++cnt);

        bw.write(String.valueOf(cnt));
        bw.flush();
    }

    private static int read() throws IOException {
        int c, n = System.in.read() & 15;
        while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);

        return n;
    }

}