백준(baekjoon)(BaekJoon)코딩 4673번:셀프 넘버 답

#include <iostream>
using namespace std;
int main() {
 int arr[10000],a,b,c,d,k,n=0;
 
  for (int i = 1; i <= 10000; i++)
  {
   a = i / 1000;
   b = ( i - a*1000 ) / 100;
   c = (i - a*1000 - b * 100) / 10;
   d =  (i - a * 1000 - b * 100 - c * 10)/1;
   k = i + a + b + c + d;
   arr[i - 1] = k;
   
  }
  for (int i = 1; i < 10000; i++)
  {
   n = 0;
   {
    for (int j = 1; j <= 10000; j++)
     if (arr[j - 1] == i)
      n++;
   }
   if(n==0)
   cout << i << endl;
  }