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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int NWD(int a, int b)
  5. {
  6.     while(a!=b)
  7.        if(a>b)
  8.            a-=b; 
  9.        else
  10.            b-=a; 
  11.     return a; 
  12. }
  13.  
  14. int main() {
  15. 	int ile, m;
  16. 	cin >> ile >> m;
  17. 	if (m>ile){
  18. 		cout << 0;
  19. 		return 0;
  20. 	}
  21. 	int tab[ile/m];
  22. 	for (int i =0; i<(ile/m); i++){
  23. 		tab[i] = m *(i+1);
  24. 		//cout << tab[i] << " ";
  25. 	}
  26. 	int wynik = (ile/m) -1;
  27. 	if (m%2 == 1){
  28. 		for (int k=1; k<(ile/m -1); k++){
  29. 			for (int i=k+1; i<ile/m; i+=2){
  30. 				wynik ++;
  31. 			//cout << tab[k] << " " << tab[i] << "\n";
  32. 			}
  33. 		}
  34. 	}
  35. 	else {
  36. 		int n = ile/m;
  37. 		for (int i =1; i<n-1; i++){
  38. 			for (int k =i+1; k<n; k++){
  39. 				//cout << tab[i] << " " << tab[k] << "\n";
  40. 				if (NWD (tab[i], tab[k]) == m){
  41. 					wynik ++;
  42. 				}
  43. 			}
  44. 		}
  45. 	}
  46.  
  47. 	cout << wynik;
  48. }
Success #stdin #stdout 0s 4528KB
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https://ideone.com/i7xlaZ
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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