1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
#include<iostream>
using namespace std;
int main()
{
    long long k,a,b,s,i=0,w=0;
    double p;
    cin>>k>>a>>b;
    s=b;
    while(s!=0)
    {
        i++;
        s/=10;
    }
    p=double(i)*81*double(k);
    if(p<b)
    {
        b=p;
    }
    i=a/k;
    if(i*k!=a)
    {
        i=k*(i+1);
    }
    else
    {
        i=a;
    }
    while(i<=b)
    {
        s=0;
        a=i;
        while(a!=0)
        {
            s+=(a%10)*(a%10);
            a/=10;
        }
        if(double(s)*k==i)
        {
            w++;
        }
        i+=k;
    }
    cout<<w;
}