2025 Day 9 Complete!

helpers/coordinate.go

@@ -42,6 +42,18 @@ func (c *Coordinate) MoveNW() {
 	c.Y--
 }
 
+func (c Coordinate) AreaTo(o Coordinate) int {
+	x1, x2 := c.X, o.X
+	y1, y2 := c.Y, o.Y
+	if x1 < x2 {
+		x1, x2 = x2, x1
+	}
+	if y1 < y2 {
+		y1, y2 = y2, y1
+	}
+	return ((x1 - x2) + 1) * ((y1 - y2) + 1)
+}
+
 func (c Coordinate) Sub(o Coordinate) Coordinate {
 	return Coordinate{
 		X: c.X - o.X,