#include <iostream> using namespace std; long long f(long long x) { long long result = 0; while(x>10) { int digit = x%10; x-=digit; digit*=digit; result+=digit; x/=10; } x*=x; result+=x; return result; } long long counter(long long k, long long a, long long b) { long long result=0; for(long long i = a; i<=b; i++) { if(k*f(i)==i) result++; } return result; } int main() { ios_base::sync_with_stdio(0); long long k, a, b; cin >> k >> a >> b; cout << endl << counter(k, a, b) << endl; return 0; }
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 | #include <iostream> using namespace std; long long f(long long x) { long long result = 0; while(x>10) { int digit = x%10; x-=digit; digit*=digit; result+=digit; x/=10; } x*=x; result+=x; return result; } long long counter(long long k, long long a, long long b) { long long result=0; for(long long i = a; i<=b; i++) { if(k*f(i)==i) result++; } return result; } int main() { ios_base::sync_with_stdio(0); long long k, a, b; cin >> k >> a >> b; cout << endl << counter(k, a, b) << endl; return 0; } |