Created
August 27, 2024 10:10
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Covid Robot problem
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| interface Command { | |
| fun execute(robot: Robot) | |
| } | |
| class TurnLeft : Command { | |
| override fun execute(robot: Robot) { | |
| robot.rotateLeft() | |
| } | |
| } | |
| class TurnRight : Command { | |
| override fun execute(robot: Robot) { | |
| robot.rotateRight() | |
| } | |
| } | |
| class MoveForward : Command { | |
| override fun execute(robot: Robot) { | |
| robot.move() | |
| } | |
| } | |
| class Robot( | |
| private var x: Int, | |
| private var y: Int, | |
| private var direction: Char, | |
| private val maxX: Int, | |
| private val maxY: Int | |
| ) { | |
| private val directions = listOf('N', 'E', 'S', 'W') | |
| fun rotateLeft() { | |
| val currentIdx = directions.indexOf(direction) | |
| direction = directions[(currentIdx - 1 + directions.size) % directions.size] | |
| } | |
| fun rotateRight() { | |
| val currentIdx = directions.indexOf(direction) | |
| direction = directions[(currentIdx + 1) % directions.size] | |
| } | |
| fun move() { | |
| when (direction) { | |
| 'N' -> if (y < maxY) y++ | |
| 'E' -> if (x < maxX) x++ | |
| 'S' -> if (y > 0) y-- | |
| 'W' -> if (x > 0) x-- | |
| } | |
| } | |
| fun executeInstructions(commands: List<Command>) { | |
| for (command in commands) { | |
| command.execute(this) | |
| } | |
| } | |
| fun getPosition(): String { | |
| return "$x $y $direction" | |
| } | |
| } | |
| class CommandInterpreter { | |
| fun interpret(input: String): List<Command> { | |
| return input.map { | |
| when (it) { | |
| 'L' -> TurnLeft() | |
| 'R' -> TurnRight() | |
| 'M' -> MoveForward() | |
| else -> throw InvalidCommandException("Invalid command: $it, only supported commands are \"L,R,M\"") | |
| } | |
| } | |
| } | |
| } | |
| class InvalidCommandException(message: String) : Exception(message) | |
| fun main() { | |
| println("Please enter covid ward upper right coordinate separated by space : Example \"5 5\"") | |
| val gridSize: List<Int> = readLine()!!.split(" ").map { it.toInt() } | |
| val maxX = gridSize[0] | |
| val maxY = gridSize[1] | |
| println("Please enter robot's initial position: Example \"1 2 N\"") | |
| val initialPosition: List<String> = readLine()!!.split(" ") | |
| val x = initialPosition[0].toInt() | |
| val y = initialPosition[1].toInt() | |
| val direction = initialPosition[2].first() | |
| println("Please enter command: Example \"LMLMLMLMM\" ") | |
| val instructions: String = readLine()!! | |
| val robot = Robot(x, y, direction, maxX, maxY) | |
| val commandInterpreter = CommandInterpreter() | |
| val commands = commandInterpreter.interpret(instructions) | |
| robot.executeInstructions(commands) | |
| println("Here is the final position of the robot") | |
| println(robot.getPosition()) | |
| } |
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