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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n, m, a, b, s;
  6. 	cin >> n >> m;
  7. 	a = n * m; // кол-во клеток на доске
  8. 	b = a % 2; // остаток
  9. 	s = (a / 2) + b; // кол-во черных клеток
  10. 	cout << s << endl;
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/LTep9G
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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