advent-of-code/2024
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

chore(lib): include helpers from last Kotlin run

Browse source 
Signed-off-by: Matej Focko <me@mfocko.xyz>
This commit is contained in:
Matej Focko 2024-12-01 13:39:53 +01:00
parent 2ce6111260
commit 47da5f8507
Signed by: mfocko
SSH key fingerprint: SHA256:icm0fIOSJUpy5+1x23sfr+hLtF9UhY8VpMC7H4WFJP8
1 changed files with 35 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

42
src/Utils.kt
View file

@ -1,12 +1,6 @@
import java.io.File
import java.math.BigInteger
import java.security.MessageDigest
import kotlin.io.path.Path
import kotlin.io.path.readText
/**
* Reads lines from the given input txt file.
*/
fun readInput(name: String) = Path("src/$name.txt").readText().trim().lines()
/**
* Converts string to md5 hash.
@ -19,3 +13,37 @@ fun String.md5() = BigInteger(1, MessageDigest.getInstance("MD5").digest(toByteA
* The cleaner shorthand for printing output.
*/
fun Any?.println() = println(this)
private fun openFile(day: Int, name: String) = File("inputs/day%02d".format(day), "$name.txt")
/**
* Reads lines from the given input txt file.
*/
fun readInput(day: Int, name: String) = openFile(day, name).readText().trim().lines()
fun readInputAsString(day: Int, name: String) = openFile(day, name).readText()
fun readInputAsInts(day: Int, name: String) = readInput(day, name).map { it.toInt() }
fun readInputAsCommaSeparatedInts(day: Int, name: String) = openFile(day, name)
.readText()
.split(",")
.map { it.toInt() }
fun readGraph(day: Int, name: String) = readInput(day, name).fold(mapOf<String, Set<String>>()) { currentGraph, edge ->
val (fromVertex, toVertex) = edge.split("-")
val fromNeighbours = currentGraph.getOrDefault(fromVertex, emptySet()) + toVertex
val toNeighbours = currentGraph.getOrDefault(toVertex, emptySet()) + fromVertex
currentGraph + mapOf(fromVertex to fromNeighbours, toVertex to toNeighbours)
}.toMap()
fun <A, B> product(xs: Sequence<A>, ys: Sequence<B>): Sequence<Pair<A, B>> =
xs.flatMap { x -> ys.map { y -> x to y } }
fun <A, B, C> product(xs: Sequence<A>, ys: Sequence<B>, zs: Sequence<C>): Sequence<Triple<A, B, C>> =
xs.flatMap { x -> ys.flatMap { y -> zs.map { z -> Triple(x, y, z) } } }
fun <A, B> product(xs: Iterable<A>, ys: Iterable<B>): Sequence<Pair<A, B>> =
product(xs.asSequence(), ys.asSequence())
fun <A, B, C> product(xs: Iterable<A>, ys: Iterable<B>, zs: Iterable<C>): Sequence<Triple<A, B, C>> =
product(xs.asSequence(), ys.asSequence(), zs.asSequence())