From 9e96943cdcbf610bbc67f9f7e10070866fcf26a6 Mon Sep 17 00:00:00 2001
From: nmcb <nmcb@xs4all.nl>
Date: Mon, 23 Feb 2026 13:54:57 +0100
Subject: [PATCH 1/2] cleanup

---
 2022/src/main/scala/aoc2022/Day24.scala |  2 +-
 2022/src/main/scala/aoc2022/Day25.scala | 46 ++++++++++++-------------
 2 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/2022/src/main/scala/aoc2022/Day24.scala b/2022/src/main/scala/aoc2022/Day24.scala
index 86ba900..6ecad40 100644
--- a/2022/src/main/scala/aoc2022/Day24.scala
+++ b/2022/src/main/scala/aoc2022/Day24.scala
@@ -49,7 +49,7 @@ object Day24 extends AoC:
   case class Streams(u: Vector[Stream], d: Vector[Stream], l: Vector[Stream], r: Vector[Stream], bounds: Bounds):
     import Field.*
     import bounds.*
-    
+
     def uAt(x: Int, y: Int): Char = u(x).drop(y).head
     def dAt(x: Int, y: Int): Char = d(x).drop(max.y - y).head
     def lAt(x: Int, y: Int): Char = l(y).drop(x).head
diff --git a/2022/src/main/scala/aoc2022/Day25.scala b/2022/src/main/scala/aoc2022/Day25.scala
index 5b3066a..a3086fd 100644
--- a/2022/src/main/scala/aoc2022/Day25.scala
+++ b/2022/src/main/scala/aoc2022/Day25.scala
@@ -30,42 +30,40 @@ object Day25 extends AoC:
       c.runtimeChecked match
         case '2' | '1' | '0' | '-' | '=' => Digit(c)
 
-  case class Number(digits: List[Digit]):
+  case class Number(digits: Vector[Digit]):
 
     def toLong: Long =
-      digits.reverse.foldLeft((0L,1L)) { case ((a, p), d) =>
-        (a + (p * d.toLong), 5L * p)
-      }.left
-
-    override def toString: String =
-      val l = toLong
-      s"${digits.mkString("")}"
+      digits
+        .reverse
+        .foldLeft((0L, 1L)):
+          case ((a, p), d) => (a + (p * d.toLong), 5L * p)
+        .left
 
   object Number:
 
-    def fromString(s: String): Number =
+    def fromString(string: String): Number =
       @tailrec
-      def loop(s: List[Char], a: List[Digit] = List.empty): Number =
-        s match
-          case Nil    => Number(a)
-          case h :: t => loop(t, a :+ Digit.fromChar(h))
-      loop(s.toList)
+      def loop(chars: Vector[Char], result: Vector[Digit] = Vector.empty): Number =
+        chars.runtimeChecked match
+          case Vector()    => Number(result)
+          case h +: t => loop(t, result :+ Digit.fromChar(h))
+      loop(string.toVector)
 
     @tailrec
-    def fromLong(l: Long, a: List[Digit] = List.empty): Number =
-      val remainder = l % 5
+    def fromLong(long: Long, result: Vector[Digit] = Vector.empty): Number =
+      val remainder = long % 5
 
       val dividend = remainder match
-        case 0 | 1 | 2 => l / 5
-        case 3         => (l + 2) / 5
-        case 4         => (l + 1) / 5
+        case 0 | 1 | 2 => long / 5
+        case 3         => (long + 2) / 5
+        case 4         => (long + 1) / 5
 
-      val acc = remainder match
-        case 0 | 1 | 2 => Digit.fromChar(remainder.toString.head) :: a
-        case 3         => Digit.fromChar('=') :: a
-        case 4         => Digit.fromChar('-') :: a
+      val next = remainder match
+        case 0 | 1 | 2 => Digit.fromChar(remainder.toString.head) +: result
+        case 3         => Digit.fromChar('=') +: result
+        case 4         => Digit.fromChar('-') +: result
 
-      if dividend == 0 then Number(acc) else fromLong(dividend, acc)
+      if dividend == 0 then Number(next) else fromLong(dividend, next)
 
 
   override lazy val answer1: String = Number.fromLong(snafus.map(_.toLong).sum).toString

From 4ee313e3325066b4208372e2dc790776794740b0 Mon Sep 17 00:00:00 2001
From: nmcb <nmcb@xs4all.nl>
Date: Mon, 23 Feb 2026 16:57:05 +0100
Subject: [PATCH 2/2] fix test

---
 2022/src/main/scala/aoc2022/Day25.scala | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/2022/src/main/scala/aoc2022/Day25.scala b/2022/src/main/scala/aoc2022/Day25.scala
index a3086fd..6569dbf 100644
--- a/2022/src/main/scala/aoc2022/Day25.scala
+++ b/2022/src/main/scala/aoc2022/Day25.scala
@@ -39,6 +39,9 @@ object Day25 extends AoC:
           case ((a, p), d) => (a + (p * d.toLong), 5L * p)
         .left
 
+    override def toString: String =
+      s"${digits.mkString("")}"
+
   object Number:
 
     def fromString(string: String): Number =