Classroom Watch (Codeforces Round #441 (Div.2) )

#include <cstdio>
#include <algorithm>
using namespace std;
int n;
int ans[300];
int main()
{
while(~scanf("%d",&n))
{
int now = max(n-90,0);
int a,b,k=0;
for(int i=now;i<=n;i++)
{
a=b=i;
while(b)
{
a+=b%10;
b/=10;
}
if(a==n)
ans[k++]=i;
}
printf("%d\n",k);
for(int i=0;i<k;i++)
printf("%d\n",ans[i]);
}
return 0;
}