десят запись

#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;

int main()
{
  int a=0, n=1, c=0, b=0;
  cin >> a;
  while (a/n!=0)
  { n*=10;
    c++;
  }
  n=10;

  int arr[c];

  for (int i=0; i<c; i++)
  {
    arr[i]=a%n;
    a/=10;
  }

  for (int i=0; i<c-1; ++i)
    {
      b=i;
      for (int j=i+1; j<c; ++j)
      {
        if (arr[j]<arr[b])
        b=j;
        swap(arr[i], arr[b]);
      }
    }


  for (int i=0; i<c; ++i)
    if (arr[i]!=arr[i+1])
     cout << arr[i] << " ";

}