#include <cstdio> #include <cmath> int func(int n) { int sum = 0; for (int i = n; i >= 1; i = i/10) sum += (i % 10)*(i % 10); return sum; } int main() { int a, b, k; int n = 0; // answer, number of ... scanf("%d%d%d", &k, &a, &b); for (int i = a; i <= b; ++i) { if (func(i)*k == i) ++n; } printf("%d\n", n); 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 | #include <cstdio> #include <cmath> int func(int n) { int sum = 0; for (int i = n; i >= 1; i = i/10) sum += (i % 10)*(i % 10); return sum; } int main() { int a, b, k; int n = 0; // answer, number of ... scanf("%d%d%d", &k, &a, &b); for (int i = a; i <= b; ++i) { if (func(i)*k == i) ++n; } printf("%d\n", n); return 0; } |