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  1. #include<iostream>
  2. using namespace std;
  3. long long n, k, sum;
  4. int main() {
  5. 	cin >> n >> k;
  6. 	for (int i = 2; i <= 6; i++) {
  7. 		long long S = 0;
  8. 		for (int j = 2; j <= n - 1; j++) {
  9. 			long long P = j * 7 + i - 7; P *= 9;
  10. 			if (P % 11 == k) { S = j; break; }
  11. 		}
  12. 		if (S == 0)continue;
  13. 		sum += ((n - 1) - S) / 11 + 1;
  14. 	}
  15. 	cout << sum << endl;
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3464KB
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https://ideone.com/zeEeqp
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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