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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. long sum_even_divisor (int n){
  5. 	long sum=0;
  6. 	for(int i=2; i<=n;i+=2){
  7. 		if(n%i==0)
  8. 		sum+=i;
  9. 	}
  10. 	if(sum==0){
  11. 		return-1;
  12. 	}
  13.     return sum;
  14. }
  15.  int Input(){
  16.  	int n;
  17.  	cin>>n;
  18. 	return n;
  19. }
  20. int main() {
  21. 	int n;
  22. 	n=Input();
  23. 	cout << sum_even_divisor(n);
  24. }
  25.  
Success #stdin #stdout 0.01s 5548KB
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stdin
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Standard input is empty
stdout
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-1
https://ideone.com/mZLsoO
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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