백준 4673번 셀프 넘버

 셀프 넘버

import java.util.ArrayList;
import java.util.Collections;
 
public class Main {
    public static void main(String[] args){
        ArrayList<Integer> list = new ArrayList<Integer>();
        for(int i=0; i<=10000; i++) {
            list.add(self_num(i));
            
        }
        Collections.sort(list);
        for(int i=0; i<=10000; i++) {
            if(!(list.contains(i))) {
                System.out.println(i);
            }
        }
    }
    static int self_num(int num) {
        int sum=0;
        String st_num = String.valueOf(num);
        sum+=num;
        for(int i=0; i<st_num.length(); i++) {
            sum+=Integer.parseInt(String.valueOf(st_num.charAt(i)));
        }
        return sum;
    }
}