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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long n;
  6. 	cin>>n;
  7. 	long long r=0;
  8. 	if (n%2==0){
  9. 		r=n/2;
  10. 	}
  11. 	else{
  12. 		r=-(n/2+1);
  13. 	}
  14. 	cout<<r;
  15. 	return 0;
  16. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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1000000000000000
stdout
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500000000000000
https://ideone.com/811Xq0
language:
C++ 4.3.2 (gcc-4.3.2)
created:
47 days ago
visibility:
public

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