down  = 323
	right = 3 * down
	tree  = '#'

	mapDown = 323
	tree    = '#'

var slopeKind = []struct {
	name  string
	right int
	down  int
}{
	{"r1d1", 1, 1},
	{"r3d1", 3, 1},
	{"r5d1", 5, 1},
	{"r7d1", 7, 1},
	{"r1d2", 1, 2},
}

	m, err := createMap()
	if err != nil {
		return err

	for _, s := range slopeKind {
		m, err := createMap(s.right * mapDown)
		if err != nil {
			return err
		}
		log.Println(s.name, countTrees(m, s.right, s.down))

	log.Println(countTrees(m))

func countTrees(m []string) int {

func countTrees(m []string, right, down int) int {

	for _, line := range m {
		if line[col] == tree {

	for i := 0; i < len(m); i += down {
		if m[i][col] == tree {

		col += 3

		col += right

func createMap() ([]string, error) {

func createMap(mapRight int) ([]string, error) {

		for line.Len() < right {

		for line.Len() < mapRight {

	if len(ret) != down {

	if len(ret) != mapDown {