[백준] 6627 The Easiest Problem is This One - Brute Force / Java

• 문제 링크

https://www.acmicpc.net/problem/6627

 

• 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 n;
        while ((n = read()) != 0) {
            int sum = sum(n), i = 11;
            while (sum != sum(n * i)) i++;
            sb.append(i).append('\n');
        }

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

    private static int sum(int n) {
        int sum = 0;
        do sum += n % 10; while ((n /= 10) > 0);

        return sum;
    }

    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;
    }

}