#include <iostream> using namespace std; int sum_of_squares(long long k) { int result = 0; while (k) { result += (k % 10) * (k % 10); k /= 10; } return result; } int main() { ios_base::sync_with_stdio(0); long long a, b, c, result = 0; cin >> c >> a >> b; for (long long i = 1; i < 1500; i++) { if (i * c < a) { continue; } if (i * c > b) { break; } int sum = sum_of_squares(i * c); if (sum == i) { result++; } } cout << result << 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 | #include <iostream> using namespace std; int sum_of_squares(long long k) { int result = 0; while (k) { result += (k % 10) * (k % 10); k /= 10; } return result; } int main() { ios_base::sync_with_stdio(0); long long a, b, c, result = 0; cin >> c >> a >> b; for (long long i = 1; i < 1500; i++) { if (i * c < a) { continue; } if (i * c > b) { break; } int sum = sum_of_squares(i * c); if (sum == i) { result++; } } cout << result << endl; return 0; } |