백준 알고리즘 4673번: 셀프 넘버 - JAVA

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

4673번: 셀프 넘버

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
import java.util.zip.InflaterInputStream;
 
public class Main {
    
    public static int op(int num){
        int sum = num;
        
        while(num!=0) {
            sum += (num%10);
            num = (num/10);
        }
        return sum;
    }
    
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
        boolean [] check = new boolean[10001]; 
        
        for(int i=1; i<10001; i++) {
            int n =  op(i);
            
            if(n < 10001) {
                check[n] = true;
            }
        }
        
        for(int i=1; i<10001; i++) {
            if(!check[i]) {
                bw.write(i+"\n");
            }
        }
        bw.flush();
        bw.close();
    }
}