240928 CCW

public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

	StringTokenizer st = new StringTokenizer(br.readLine());
	int x1 = Integer.parseInt(st.nextToken());
	int y1 = Integer.parseInt(st.nextToken());

	st = new StringTokenizer(br.readLine());
	int x2 = Integer.parseInt(st.nextToken());
	int y2 = Integer.parseInt(st.nextToken());

	st = new StringTokenizer(br.readLine());
	int x3 = Integer.parseInt(st.nextToken());
	int y3 = Integer.parseInt(st.nextToken());

	System.out.println(computeCCW(x1, y1, x2, y2, x3, y3));
	}

private static int computeCCW(int x1, int y1, int x2, int y2, int x3, int y3) {
	int temp = x1 * y2 + x2 * y3 + x3 * y1 - (y1 * x2 + y2 * x3 + y3 * x1);

	if (temp > 0)
		return 1;
	if (temp == 0)
		return 0;

	return -1;
}

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