CCW Best Practice

#include <iostream>
using namespace std;
long long ccw(long long x1, long long y1, long long x2, long long y2, long long x3, long long y3) {
	long long v = (x1 * y2 + x2 * y3 + x3 * y1) - (x2 * y1 + x3 * y2 + x1 * y3);
    if(v == 0) return 0;
	return v / abs(v);
}
int main() {
    long long x1, y1, x2, y2, x3, y3; cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
    cout << ccw(x1, y1, x2, y2, x3, y3);
    return 0;
}