2019 Day 12 Complete

helpers/helpers.go

@@ -27,6 +27,23 @@ const (
 	MIN_INT = -MAX_INT - 1
 )
 
+// Find the greatest common denominator
+func Gcd(x, y int) int {
+	for y != 0 {
+		x, y = y, x%y
+	}
+	return x
+}
+
+// Find the least common multiple, using gcd
+func Lcm(a, b int, integers ...int) int {
+	result := a * b / Gcd(a, b)
+	for i := 0; i < len(integers); i++ {
+		result = Lcm(result, integers[i])
+	}
+	return result
+}
+
 func AbsInt(i int) int {
 	if i < 0 {
 		return i * -1