1// compile
2
3// Copyright 2023 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7package p
8
9func sign(p1, p2, p3 point) bool {
10	return (p1.x-p3.x)*(p2.y-p3.y)-(p2.x-p3.x)*(p1.y-p3.y) < 0
11}
12
13type point struct {
14	x, y int
15}
16