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55 lines
1.6 KiB
55 lines
1.6 KiB
package day1
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import java.io.File
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object Day1 {
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fun calculateOne(input : List<String>) = input
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.filter(String::isNotBlank)
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.fold(0, addMagicNumber())
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fun calculateTwo(input : List<String>) = input
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.filter(String::isNotBlank)
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.map(::replaceElvenNumbers)
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.fold(0, addMagicNumber())
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private fun addMagicNumber() = { accumulator: Int, line: String ->
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val firstDigit = NUMBER_REGEX.findAll(line).first().value
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val secondDigit = NUMBER_REGEX.findAll(line).last().value
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val total = (firstDigit + secondDigit).toInt() + accumulator
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total
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}
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private fun replaceElvenNumbers(string: String): String =
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string.mapIndexed { index, _ ->
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readElvenNumberAtStart(string.substring(index))
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}.joinToString(separator = "")
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private fun readElvenNumberAtStart(string: String) = when {
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string.isBlank() -> ""
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string[0].isDigit() -> string[0].toString()
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string.startsWith("one") -> "1"
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string.startsWith("two") -> "2"
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string.startsWith("three") -> "3"
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string.startsWith("four") -> "4"
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string.startsWith("five") -> "5"
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string.startsWith("six") -> "6"
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string.startsWith("seven") -> "7"
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string.startsWith("eight") -> "8"
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string.startsWith("nine") -> "9"
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else -> ""
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}
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fun answerOne() =
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File("src/main/resources/day1/input.txt")
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.readLines()
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.let(::calculateOne)
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fun answerTwo() =
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File("src/main/resources/day1/input.txt")
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.readLines()
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.let(::calculateTwo)
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private val NUMBER_REGEX = Regex("\\d")
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}
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