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  1. #include <iostream>
  2. #include<vector>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	// your code goes here
  7. 	vector<int> cards(51,0);
  8. 	for(int i=1;i<=50;i++){
  9. 		for(int j=i;j<=50;j+=i){
  10. 			cards[j] = 1 - cards[j];
  11. 		}
  12. 	}
  13. 	int ans = 0;
  14. 	for(int i=0;i<=50;i++) {
  15. 		if(cards[i] == 1) ans++;
  16. 	}
  17. 	cout << ans << endl;
  18. 	return 0;
  19. }
Success #stdin #stdout 0.01s 5508KB
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https://ideone.com/UhHEZw
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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