Advent of Code 2022 Day 1

day1.kt

// Use this "Day" Interface to facilitate running the code. This will be re-used for each day's problem.
interface Day<T> {
    fun getInput(): T
    fun part1(input: T): Number
    fun part2(input: T): Number

    fun run() {
        val input = getInput()
        var start = System.currentTimeMillis()
        println("Part 1: ${part1(input)} (${System.currentTimeMillis() - start}ms)")
        start = System.currentTimeMillis()
        println("Part 2: ${part2(input)} (${System.currentTimeMillis() - start}ms)")
    }
}

class Day1: Day<List<List<Int>>> {
    override fun getInput(): List<List<Int>> {
        return this.javaClass.classLoader.getResource("day1/input.txt")!!
            .readText()
            .split("\n\n")
            .map {
                it.lines()
                .map { num -> num.toInt() }
            }
    }

    override fun part1(input: List<List<Int>>): Number {
        return input.maxOf { it.sum() }
    }

    override fun part2(input: List<List<Int>>): Number {
        return input.map { it.sum() }
            .sortedDescending()
            .subList(0,3)
            .sum()
    }

}