[백준] 4084 Viva la Diferencia - Implementation / Java

• 문제 링크

https://www.acmicpc.net/problem/4084

 

• 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));
        StringBuilder sb = new StringBuilder();

        int a;
        while ((a = read()) != 0) {
            int b = read(), c = read(), d = read(), cnt = 0;
            while (a != b || b != c || c != d) {
                int i = a;
                a = Math.abs(a - b);
                b = Math.abs(b - c);
                c = Math.abs(c - d);
                d = Math.abs(d - i);
                cnt++;
            }
            sb.append(cnt).append('\n');
        }

        bw.write(sb.toString());
        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;
    }

}