[백준/자바] 4673번 해설 - Java

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

4673번: 셀프 넘버

 

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