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Replace "numerical" by "numeric" #797

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Merged
merged 1 commit into from
Dec 22, 2024
Merged

Replace "numerical" by "numeric" #797

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16 changes: 8 additions & 8 deletions 2024/src/day21.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -11,13 +11,13 @@ case class Pos(x: Int, y: Int):
def projX = Pos(x, 0)
def projY = Pos(0, y)

val numericalKeypad = Map(
val numericKeypad = Map(
'7' -> Pos(0, 0), '8' -> Pos(1, 0), '9' -> Pos(2, 0),
'4' -> Pos(0, 1), '5' -> Pos(1, 1), '6' -> Pos(2, 1),
'1' -> Pos(0, 2), '2' -> Pos(1, 2), '3' -> Pos(2, 2),
'0' -> Pos(1, 3), 'A' -> Pos(2, 3),
)
val numericalKeypadPositions = numericalKeypad.values.toSet
val numericKeypadPositions = numericKeypad.values.toSet

val directionalKeypad = Map(
'^' -> Pos(1, 0), 'A' -> Pos(2, 0),
Expand All @@ -37,17 +37,17 @@ def minPathStep(from: Pos, to: Pos, positions: Set[Pos]): String =
val reverse = !positions(from + shift.projX) || (positions(from + shift.projY) && shift.x > 0)
if reverse then v + h + 'A' else h + v + 'A'

def minPath(input: String, isNumerical: Boolean = false): String =
val keypad = if isNumerical then numericalKeypad else directionalKeypad
val positions = if isNumerical then numericalKeypadPositions else directionalKeypadPositions
def minPath(input: String, isNumeric: Boolean = false): String =
val keypad = if isNumeric then numericKeypad else directionalKeypad
val positions = if isNumeric then numericKeypadPositions else directionalKeypadPositions
(s"A$input").map(keypad).sliding(2).map(p => minPathStep(p(0), p(1), positions)).mkString

def part1(input: String): Long =
input
.linesIterator
.filter(_.nonEmpty)
.map: line => // 029A
val path1 = minPath(line, isNumerical = true) // <A^A^^>AvvvA
val path1 = minPath(line, isNumeric = true) // <A^A^^>AvvvA
val path2 = minPath(path1) // v<<A>>^A<A>A<AAv>A^A<vAAA^>A
val path3 = minPath(path2) // <vA<AA>>^AvAA<^A>Av<<A>>^AvA^Av<<A>>^AA<vA>A^A<A>Av<<A>A^>AAA<Av>A^A
val num = line.init.toLong // 29
Expand All @@ -66,7 +66,7 @@ def part1(input: String): Long =
val cache = collection.mutable.Map.empty[(Pos, Pos, Int, Int), Long]
def minPathStepCost(from: Pos, to: Pos, level: Int, maxLevel: Int): Long =
cache.getOrElseUpdate((from, to, level, maxLevel), {
val positions = if level == 0 then numericalKeypadPositions else directionalKeypadPositions
val positions = if level == 0 then numericKeypadPositions else directionalKeypadPositions
val shift = to - from
val h = (if shift.x > 0 then ">" else "<") * shift.x.abs
val v = (if shift.y > 0 then "v" else "^") * shift.y.abs
Expand All @@ -76,7 +76,7 @@ def minPathStepCost(from: Pos, to: Pos, level: Int, maxLevel: Int): Long =
})

def minPathCost(input: String, level: Int, maxLevel: Int): Long =
val keypad = if level == 0 then numericalKeypad else directionalKeypad
val keypad = if level == 0 then numericKeypad else directionalKeypad
(s"A$input").map(keypad).sliding(2).map(p => minPathStepCost(p(0), p(1), level, maxLevel)).sum

def part2(input: String): Long =
Expand Down