/C++/Calculating Function codeforces in c++

Calculating Function codeforces in c++

#include<iostream>
using namespace std;
int main()
{
	long long n, sum;
	cin >> n;
	if (n % 2 == 0)
		sum = (n / 2);
	else
		sum = ((n + 1) / 2) * (-1);
	cout << sum << endl;
	return 0;
}

Source: codeforces.com

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