[Swift]Simplified point type for competitive programming

Point+Competitive.swift

typealias Point = (x: Int, y: Int)
func ==(lhs: Point, rhs: Point) -> Bool { return lhs.x == rhs.x && lhs.y == rhs.y }
func !=(lhs: Point, rhs: Point) -> Bool { return !(lhs == rhs) }
func +(lhs: Point, rhs: Point) -> Point { return Point(lhs.x + rhs.x, lhs.y + rhs.y) }
func +=(inout lhs: Point, rhs: Point) { lhs.x += rhs.x; lhs.y += rhs.y }
func -(lhs: Point, rhs: Point) -> Point { return Point(lhs.x - rhs.x, lhs.y - rhs.y) }
func -=(inout lhs: Point, rhs: Point) { lhs.x -= rhs.x; lhs.y -= rhs.y }
let neighborhood8: [Point] = [
    (0, -1), (1, -1), (1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1)
]
let neighborhood4: [Point] = [
    (0, -1), (1, 0), (0, 1), (-1, 0)
]