#include <bits/stdc++.h> using namespace std; const int MAX_SUM = 81 * 18; int sumOfDigitsSquares(long long x) { int ret = 0; while (x) { ret += (x % 10) * (x % 10); x /= 10; } return ret; } int main() { long long k, a, b; scanf("%lld %lld %lld", &k, &a, &b); int ans = 0; for (int i = 0; i <= MAX_SUM; i++) { if (k * i > b) { break; } if (a <= k * i && k * i <= b && sumOfDigitsSquares(k * i) == i) { ans++; } } printf("%d\n", ans); 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 | #include <bits/stdc++.h> using namespace std; const int MAX_SUM = 81 * 18; int sumOfDigitsSquares(long long x) { int ret = 0; while (x) { ret += (x % 10) * (x % 10); x /= 10; } return ret; } int main() { long long k, a, b; scanf("%lld %lld %lld", &k, &a, &b); int ans = 0; for (int i = 0; i <= MAX_SUM; i++) { if (k * i > b) { break; } if (a <= k * i && k * i <= b && sumOfDigitsSquares(k * i) == i) { ans++; } } printf("%d\n", ans); return 0; } |