[11758] CCW

https://www.acmicpc.net/problem/11758

11758번: CCW

<문제>

ccw 기본문제

 

<소스코드>

#include <bits/stdc++.h>

using namespace std;

typedef struct {

    int x, y;

} point;

int ccw(point a, point b, point c) {

    return (a.x * b.y + b.x * c.y + c.x * a.y) -

           (b.x * a.y + c.x * b.y + a.x * c.y);

}

int main(void) {

    ios_base::sync_with_stdio(0);

    cin.tie(0);

    point a, b, c;

    cin >> a.x >> a.y >> b.x >> b.y >> c.x >> c.y;

    int ret = ccw(a, b, c);

    if (ret > 0)

        cout << 1;

    else if (ret < 0)

        cout << -1;

    else

        cout << 0;

    return 0;

}