Day 1 Scala

src/aoc.scala

@@ -4,4 +4,4 @@ import scala.io.Source
 import scala.util.Using
 
 def loadInput(dayNumber: String) =
-  Using.resource(Source.fromFile(s"input/day$dayNumber"))(_.mkString)
+  Using.resource(Source.fromFile(s"input/day$dayNumber"))(_.mkString.trim)

src/day01.scala

@@ -1,5 +1,46 @@
 package aoc
 package day01
 
+import scala.annotation.tailrec
+
+val dayNumber = "01"
+
 @main def part1: Unit =
-  println(loadInput("01"))
+  println(part1(loadInput(dayNumber)))
+
+@main def part2: Unit =
+  println(part2(loadInput(dayNumber)))
+
+def part1(input: String): String =
+  input
+    .split("\n")
+    .map(line =>
+      line.find(_.isDigit).get.toString + line.findLast(_.isDigit).get.toString
+    )
+    .map(_.toInt)
+    .sum
+    .toString
+
+def part2(input: String): String =
+  val digitsList = (1 to 9).map(_.toString)
+  val digitsMap =
+    List("one", "two", "three", "four", "five", "six", "seven", "eight", "nine")
+      .zip(digitsList)
+      .prependedAll(digitsList.zip(digitsList))
+
+  @tailrec def findFistDigit(line: String): String =
+    digitsMap.find((key, _) => line.startsWith(key)) match
+      case Some((_, digit)) => digit
+      case None             => findFistDigit(line.substring(1))
+
+  @tailrec def findLastDigit(line: String): String =
+    digitsMap.find((key, _) => line.endsWith(key)) match
+      case Some((_, digit)) => digit
+      case None             => findLastDigit(line.substring(0, line.length - 1))
+
+  input
+    .split("\n")
+    .map(line => findFistDigit(line) + findLastDigit(line))
+    .map(_.toInt)
+    .sum
+    .toString