package aoc2019

import "math"

func greatestCommonDivisor(a, b int64) int64 {
	for b != 0 {
		t := b
		b = a % b
		a = t
	}
	return a
}

func manhattenDistance(x1, y1, x2, y2 int) int {
	return int(math.Abs(float64(x1-x2)) + math.Abs(float64(y1-y2)))
}