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@eingruenesbeb
Created December 1, 2023 16:13
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A solution to the first problem of the "Advent of Code 2023" event
import java.lang.IllegalArgumentException
val inputText = """
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""".trimIndent()
/**
* The ordinal is the corresponding number.
*/
enum class ValidDigits {
ZERO,
ONE,
TWO,
THREE,
FOUR,
FIVE,
SIX,
SEVEN,
EIGHT,
NINE;
fun stringRepresentations() = when (this) {
ZERO -> listOf("0", "zero")
ONE -> listOf("1", "one")
TWO -> listOf("2", "two")
THREE -> listOf("3", "three")
FOUR -> listOf("4", "four")
FIVE -> listOf("5", "five")
SIX -> listOf("6", "six")
SEVEN -> listOf("7", "seven")
EIGHT -> listOf("8", "eight")
NINE -> listOf("9", "nine")
}
companion object {
fun fromStringRepresentation(input: String) = when(input) {
in ZERO.stringRepresentations() -> ZERO.ordinal
in ONE.stringRepresentations() -> ONE.ordinal
in TWO.stringRepresentations() -> TWO.ordinal
in THREE.stringRepresentations() -> THREE.ordinal
in FOUR.stringRepresentations() -> FOUR.ordinal
in FIVE.stringRepresentations() -> FIVE.ordinal
in SIX.stringRepresentations() -> SIX.ordinal
in SEVEN.stringRepresentations() -> SEVEN.ordinal
in EIGHT.stringRepresentations() -> EIGHT.ordinal
in NINE.stringRepresentations() -> NINE.ordinal
else -> throw IllegalArgumentException()
}
fun allRepresentations() = buildList {
ValidDigits.entries.forEach {
this.addAll(it.stringRepresentations())
}
}
}
}
fun splitText(text: String) = text.splitToSequence("\n")
fun calculate(sequence: Sequence<String>): Int {
val validDigitRepresentations = ValidDigits.allRepresentations()
return sequence.fold(0) { current, element ->
val toAdd = buildString(2) {
val firstDigit = element.findAnyOf(validDigitRepresentations)?.second?.let {
ValidDigits.fromStringRepresentation(it)
} ?: 0
val lastDigit = element.findLastAnyOf(validDigitRepresentations)?.second?.let {
ValidDigits.fromStringRepresentation(it)
} ?: 0
this.append("$firstDigit$lastDigit")
}
current + toAdd.toInt()
}
}
fun main() {
println(calculate(splitText(inputText)))
}
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