Day 8
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package com.basdado.adventofcode
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import java.util.stream.Stream
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fun main() {
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val day = Day8()
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day.puzzle1()
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day.puzzle2()
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}
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class Day8 {
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fun puzzle1() {
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val root = parseInput()
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println(flatMap(root) { it.metadata.stream() }.mapToInt{ it }.sum())
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}
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fun puzzle2() {
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val root = parseInput()
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println(findValue(root))
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}
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private fun parseInput(): Node {
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val input = lines("/day/8/input.txt")
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.findFirst().get()
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.split(Regex("""\s+"""))
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.map { it.toInt() }
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.toIntArray()
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return parse(input)
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}
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fun parse(arr: IntArray, startIndex: Int = 0): Node {
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var index = startIndex;
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val nodeCount = arr[index++]
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val metadataCount = arr[index++]
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var children = mutableListOf<Node>()
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for (i in 0 until nodeCount) {
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val newChild = parse(arr, index)
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index = newChild.endIndex
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children.add(newChild)
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}
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val metadata = arr.copyOfRange(index, index + metadataCount).toList()
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index += metadataCount
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return Node(children, metadata, index)
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}
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fun <T> flatMap(node: Node, mapping: Function1<Node, Stream<T>>): Stream<T> {
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var res = mapping.invoke(node)
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for (child in node.children) {
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res = Stream.concat(res, flatMap(child, mapping))
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}
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return res
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}
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fun findValue(node: Node): Int {
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if (node.children.isEmpty()) {
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return node.metadata.toIntArray().sum()
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} else {
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var sum = 0
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for (index in node.metadata) {
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if (index > 0 && index <= node.children.size) {
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sum += findValue(node.children[index - 1])
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}
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}
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return sum
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}
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}
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data class Node (val children: List<Node>, val metadata: List<Int>, val endIndex: Int)
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}
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