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/**
* Given a list of correct command strings, dispatch [action] taking command name and argument on each of them.
* @param commands list of valid command strings
* @param action function taking a string (command name) and integer (argument) that gets called for each command
*/
fun dispatchCommands(commands: List<String>, action: (command: String, argument: Int) -> Unit) {
for (line in commands) {
val parts = line.split(" ")
val command = parts[0]
val argument = parts[1].toInt()
action(command, argument)
}
}
fun main() {
fun part1(input: List<String>): Int {
var horizontal = 0
var depth = 0
dispatchCommands(input) { command, argument ->
when (command) {
"forward" -> horizontal += argument
"down" -> depth += argument
"up" -> depth -= argument
}
}
return horizontal * depth
}
fun part2(input: List<String>): Int {
var horizontal = 0
var depth = 0
var aim = 0
dispatchCommands(input) { command, argument ->
when (command) {
"forward" -> {
horizontal += argument
depth += aim * argument
}
"down" -> aim += argument
"up" -> aim -= argument
}
}
return horizontal * depth
}
val testInput = readInputAsLines("Day02_test")
check(part1(testInput) == 150)
check(part2(testInput) == 900)
val input = readInputAsLines("Day02")
println(part1(input))
println(part2(input))
}
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