leetcode-go/leetcode/medium/223.rectangle-area.go

func computeArea(A int, B int, C int, D int, E int, F int, G int, H int) int {
	return areaOf(A, B, C, D) + areaOf(E, F, G, H) - overlap(A, C, E, G)*overlap(B, D, F, H)
}

func overlap(a1, a2, b1, b2 int) int {
	l := a2 - a1 + b2 - b1 - (maxInt(a2, b2) - minInt(a1, b1))
	if l < 0 {
		return 0
	}
	return l
}

func areaOf(A, B, C, D int) int {
	return (C - A) * (D - B)
}

func maxInt(x, y int) int {
	if x < y {
		return y
	}
	return x
}

func minInt(x, y int) int {
	if x < y {
		return x
	}
	return y
}