advent-of-code/2021
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day(12): follow DRY

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Signed-off-by: Matej Focko <mfocko@redhat.com>
This commit is contained in:
Matej Focko 2021-12-12 10:07:23 +01:00
parent 4d99c4d6d9
commit 3203126dad
1 changed files with 3 additions and 5 deletions
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8
src/year2021/day12/Day12.kt
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@ -15,12 +15,10 @@ fun findAllPaths(
val neighbours = graph
.getOrDefault(path.last(), emptySet())
.filter { it == it.uppercase() || (!twiceVisited && it != "start") || !visited.contains(it) }
.map { it to ((it == it.lowercase() && visited.contains(it)) || twiceVisited) }
return neighbours.map { neighbour ->
if (neighbour == neighbour.lowercase() && visited.contains(neighbour))
findAllPaths(graph, path + neighbour, visited, true)
else
findAllPaths(graph, path + neighbour, visited + neighbour, twiceVisited)
return neighbours.map { (neighbour, newTwiceVisited) ->
findAllPaths(graph, path + neighbour, visited + neighbour, newTwiceVisited)
}.fold(emptySet()) { acc, it -> acc + it }
}