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@@ -79,6 +79,79 @@ func rotate(currentDirection string, item sequence) string {
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return directions[newDirectionIndex]
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}
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+type cooridinates struct {
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+ north int
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+ south int
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+ east int
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+ west int
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+}
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+
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+func makeMove(item sequence, position cooridinates) cooridinates {
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+ switch item.action {
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+ case "E":
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+ if position.west > 0 {
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+ position.west = position.west - item.value
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+ if position.west < 0 {
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+ position.east -= position.west
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+ position.west = 0
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+ }
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+ } else {
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+ position.east += item.value
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+ }
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+ case "W":
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+ if position.east > 0 {
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+ position.east = position.east - item.value
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+ if position.east < 0 {
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+ position.west -= position.east
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+ position.east = 0
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+ }
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+ } else {
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+ position.west += item.value
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+ }
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+ case "N":
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+ if position.south > 0 {
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+ position.south = position.south - item.value
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+ if position.south < 0 {
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+ position.north -= position.south
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+ position.south = 0
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+ }
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+ } else {
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+ position.north += item.value
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+ }
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+ case "S":
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+ if position.north > 0 {
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+ position.north = position.north - item.value
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+ if position.north < 0 {
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+ position.south -= position.north
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+ position.north = 0
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+ }
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+ } else {
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+ position.south += item.value
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+ }
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+ }
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+
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+ return position
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+}
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+
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+func navigate(sequences []sequence) int {
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+ currentDirection := "E"
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+ currentPosition := cooridinates{north: 0, south: 0, east: 0, west: 0}
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+
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+ for _, item := range sequences {
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+ switch item.action {
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+ case "L", "R":
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+ currentDirection = rotate(currentDirection, item)
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+ case "E", "W", "N", "S":
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+ currentPosition = makeMove(item, currentPosition)
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+ case "F":
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+ item.action = currentDirection
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+ currentPosition = makeMove(item, currentPosition)
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+ }
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+ }
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+
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+ return currentPosition.north + currentPosition.south + currentPosition.east + currentPosition.west
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+}
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+
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func main() {
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if len(os.Args) < 2 {
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log.Fatal("You need to specify a file!")
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@@ -96,7 +169,6 @@ func main() {
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}
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file.Close()
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- fmt.Println(sequences)
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getDirections()
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- fmt.Println(rotate("E", sequence{action: "L", value: 270}))
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+ fmt.Println("Part1:", navigate(sequences))
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}
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