[BOJ] 백준 4673번: 셀프 넘버 (Java)

문제링크

https://www.acmicpc.net/problem/4673

4673번: 셀프 넘버

---

나의코드

import java.util.*;

public class Main{
    public static void main(String[] args){
        boolean[] answer = new boolean[10001];
        
        for(int i = 1; i < 10001; i++){
            int n = d(i);
            
            if(n < 10001){
                answer[n] = true;
            }
        }
        
        StringBuilder sb = new StringBuilder();
        
        for(int i = 1; i < 10001; i++){
            if(!answer[i]){
                sb.append(i).append('\n');
            }
        }
        System.out.println(sb);        
    }
    
    public static int d(int n){
        int sum = n;
        while(n != 0){
            sum = sum + (n % 10);
            n = n / 10;
        }
        return sum;
    }
}