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Merged
nmcb merged 1 commit into from
Aug 1, 2026
Merged

cleanup #234

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33 changes: 17 additions & 16 deletions 2017/src/main/scala/aoc2017/Day25.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ package aoc2017
import nmcb.*
import nmcb.predef.*

import scala.collection.Iterator.iterate

object Day25 extends AoC:

enum Move derives CanEqual:
Expand All @@ -11,7 +13,7 @@ object Day25 extends AoC:

import Move.*

type State = String
type State = Char
type Value = Int
type Position = Int
type Tape = Map[Position, Value]
Expand Down Expand Up @@ -82,22 +84,21 @@ object Day25 extends AoC:
* - Continue with state E.
*
*/
val beginState: State = "A"
val steps: Int = 12317297
val beginState: State = 'A'
val transitions: Transitions =
Map(
("A", 0) -> ("B", 1, R),
("A", 1) -> ("D", 0, L),
("B", 0) -> ("C", 1, R),
("B", 1) -> ("F", 0, R),
("C", 0) -> ("C", 1, L),
("C", 1) -> ("A", 1, L),
("D", 0) -> ("E", 0, L),
("D", 1) -> ("A", 1, R),
("E", 0) -> ("A", 1, L),
("E", 1) -> ("B", 0, R),
("F", 0) -> ("C", 0, R),
("F", 1) -> ("E", 0, R),
('A', 0) -> ('B', 1, R),
('A', 1) -> ('D', 0, L),
('B', 0) -> ('C', 1, R),
('B', 1) -> ('F', 0, R),
('C', 0) -> ('C', 1, L),
('C', 1) -> ('A', 1, L),
('D', 0) -> ('E', 0, L),
('D', 1) -> ('A', 1, R),
('E', 0) -> ('A', 1, L),
('E', 1) -> ('B', 0, R),
('F', 0) -> ('C', 0, R),
('F', 1) -> ('E', 0, R),
)

case class Turing(
Expand All @@ -124,4 +125,4 @@ object Day25 extends AoC:

def turing: Turing = Turing(transitions, beginState)

override lazy val answer1: Int = Iterator.iterate(turing)(_.step).nth(steps).tape.count(_.right == 1)
override lazy val answer1: Int = iterate(turing)(_.step).nth(12317297).tape.count(_.right == 1)