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Author SHA1 Message Date
9f27d02b93 day 4 puzzle 2 2023-12-04 07:44:35 +01:00
6a9dfc8ef1 day 4 puzzle 1 2023-12-04 07:30:50 +01:00
6 changed files with 124 additions and 8 deletions

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@ -5,11 +5,11 @@ This repo contains my attempt at this year's Advent of Code (2023)
I will try and do some problems (probably not all of them) in Scala
## Progress:
#### Stars: 6 / 50
#### Stars: 8 / 50
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|:---:|:---:|:---:|:---:|:-----------------:|:-----------------:|:-----------------:|
|:-----------------:|:---:|:---:|:---:|:-----------------:|:-----------------:|:-----------------:|
| | | | | 1<br>:star::star: | 2<br>:star::star: | 3<br>:star::star: |
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 4<br>:star::star: | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | | | | | | |

44
src/day4/Puzzle1.scala Normal file
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package day4
import scala.io.{BufferedSource, Source}
object Puzzle1 {
case class Card(validNumbers: Array[Int], myNumbers: Array[Int])
var cards: Array[Card] = Array.empty
def loadInput(path: String): Unit = {
val source: BufferedSource = Source.fromFile(path)
val lines: Array[String] = source.getLines().toArray
cards = new Array(lines.length)
for ((line: String, i: Int) <- lines.zipWithIndex) {
val parts: Array[String] = line.split(": +")(1).split(" +\\| +")
val validNumbers: Array[Int] = parts(0).split(" +").map(n => n.toInt)
val myNumbers: Array[Int] = parts(1).split(" +").map(n => n.toInt)
cards(i) = Card(validNumbers, myNumbers)
}
source.close()
}
def computeGain(): Int = {
var gain: Int = 0
for (card: Card <- cards) {
val validCount: Int = card.validNumbers.intersect(card.myNumbers).length
if (validCount >= 1) {
gain += Math.pow(2, validCount-1).toInt
}
}
return gain
}
def solve(path: String): Int = {
loadInput(path)
return computeGain()
}
def main(args: Array[String]): Unit = {
val solution: Int = solve("res/day4/input1.txt")
println(solution)
}
}

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src/day4/Puzzle2.scala Normal file
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package day4
import scala.collection.mutable
import scala.io.{BufferedSource, Source}
object Puzzle2 {
case class Card(id: Int, validNumbers: Array[Int], myNumbers: Array[Int], var score: Int = 0, var count: Int = 1)
var cards: Array[Card] = Array.empty
def loadInput(path: String): Unit = {
val source: BufferedSource = Source.fromFile(path)
val lines: Array[String] = source.getLines().toArray
cards = new Array(lines.length)
for ((line: String, i: Int) <- lines.zipWithIndex) {
val parts: Array[String] = line.split(": +")(1).split(" +\\| +")
val validNumbers: Array[Int] = parts(0).split(" +").map(n => n.toInt)
val myNumbers: Array[Int] = parts(1).split(" +").map(n => n.toInt)
cards(i) = Card(i, validNumbers, myNumbers)
}
source.close()
}
def computeScores(): Unit = {
for (card: Card <- cards) {
card.score = card.validNumbers.intersect(card.myNumbers).length
}
}
def solve(path: String): Int = {
loadInput(path)
computeScores()
var count: Int = 0
for (card: Card <- cards) {
count += card.count
for (i: Int <- 0 until card.score) {
cards(card.id + i + 1).count += card.count
}
}
return count
}
def main(args: Array[String]): Unit = {
val solution: Int = solve("res/day4/input1.txt")
println(solution)
}
}

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package day4
import org.scalatest.funsuite.AnyFunSuite
class Puzzle1Test extends AnyFunSuite {
test("Puzzle1.solve") {
assert(Puzzle1.solve("tests_res/day4/input1.txt") == 13)
}
}

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@ -0,0 +1,9 @@
package day4
import org.scalatest.funsuite.AnyFunSuite
class Puzzle2Test extends AnyFunSuite {
test("Puzzle2.solve") {
assert(Puzzle2.solve("tests_res/day4/input1.txt") == 30)
}
}

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@ -0,0 +1,6 @@
Card 1: 41 48 83 86 17 | 83 86 6 31 17 9 48 53
Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
Card 3: 1 21 53 59 44 | 69 82 63 72 16 21 14 1
Card 4: 41 92 73 84 69 | 59 84 76 51 58 5 54 83
Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11