abc184_a - Determinant
08 Dec 2020 — Tags: easy — URL$a \times d - b \times c$.
Time complexity: $O(1)$
Memory complexity: $O(1)$
Click to show code.
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using vi = vector<int>;
template <typename InputIterator,
typename T = typename iterator_traits<InputIterator>::value_type>
void read_n(InputIterator it, int n)
{
copy_n(istream_iterator<T>(cin), n, it);
}
template <typename InputIterator,
typename T = typename iterator_traits<InputIterator>::value_type>
void write(InputIterator first, InputIterator last, const char *delim = "\n")
{
copy(first, last, ostream_iterator<T>(cout, delim));
}
int main(void)
{
ios::sync_with_stdio(false), cin.tie(NULL);
int a, b, c, d;
cin >> a >> b >> c >> d;
cout << a * d - b * c << endl;
return 0;
}