advent-of-code-2023

Welcome to the Advent of Code¹ Kotlin project created by shalva97 using the Advent of Code Kotlin Template delivered by JetBrains.

In this repository, shalva97 is about to provide solutions for the puzzles using Kotlin language.

If you're stuck with Kotlin-specific questions or anything related to this template, check out the following resources:

• Kotlin docs
• Kotlin Slack
• Template issue tracker

Solutions

Day 1

fun part1(input: List<String>): Int {
    return input.sumOf { line ->
        "${line.first { it.isDigit() }}${line.last { it.isDigit() }}".toInt()
    }
}

fun part2(input: List<String>): Int {
    return input.map {
        it
            .replace("eightwo", "82")
            .replace("oneight", "18")
            .replace("twone", "21")
            .replace("threeight", "38")
            .replace("fiveight", "58")
            .replace("sevenine", "79")
            .replace("one", "1")
            .replace("two", "2")
            .replace("three", "3")
            .replace("four", "4")
            .replace("five", "5")
            .replace("six", "6")
            .replace("seven", "7")
            .replace("eight", "8")
            .replace("nine", "9")
    }.run(::part1)
}

val testInput = readInput("Day01_test")
part1(testInput).println()
part2(testInput).println()

Footnotes

1. Advent of Code – An annual event of Christmas-oriented programming challenges started December 2015. Every year since then, beginning on the first day of December, a programming puzzle is published every day for twenty-five days. You can solve the puzzle and provide an answer using the language of your choice. ↩