#include <iostream> using namespace std; int sumSquares(long long n){ int sum = 0; while(n > 0){ int digit = n % 10; n /= 10; sum += digit * digit; } return sum; } int main(){ long long k, a, b, n; int limit = 19 * 81; int count = 0; cin >> k >> a >> b; for(int i=1; i<=limit; i++){ n = i * k; if(n > b || n < 0) break; if(n >= a && n <= b && k * sumSquares(n) == n){ count++; //cout << n << endl; } } cout << count << 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 | #include <iostream> using namespace std; int sumSquares(long long n){ int sum = 0; while(n > 0){ int digit = n % 10; n /= 10; sum += digit * digit; } return sum; } int main(){ long long k, a, b, n; int limit = 19 * 81; int count = 0; cin >> k >> a >> b; for(int i=1; i<=limit; i++){ n = i * k; if(n > b || n < 0) break; if(n >= a && n <= b && k * sumSquares(n) == n){ count++; //cout << n << endl; } } cout << count << endl; return 0; } |