Created
February 26, 2023 20:11
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Return the cache so it is not needed to use mutable map (horrible)
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| object GridTraveler extends App { | |
| def gridTraveler(r: Int, c: Int, cache: collection.mutable.Map[(Int, Int), Long]): Long = { | |
| cache.get((r, c)) match { | |
| case Some(n) => return n | |
| case None => | |
| } | |
| cache.get((c, r)) match { | |
| case Some(n) => return n | |
| case None => | |
| } | |
| if (r <= 0) return 0 | |
| if (c <= 0) return 0 | |
| if (r == 1 & c == 1) return 1 | |
| val result = gridTraveler(r - 1, c, cache) + gridTraveler(r, c - 1, cache) // can't inline because of compiler errors... | |
| cache += ((r, c) -> result) | |
| cache((r, c)) | |
| } | |
| println(gridTraveler(0, 1, collection.mutable.Map.empty)) | |
| //println(gridTraveler(1, 0, Map.empty)) | |
| println() | |
| // println(gridTraveler(1, 1, Map.empty)) | |
| // println(gridTraveler(2, 3, Map.empty)) | |
| // println(gridTraveler(3, 2, Map.empty)) | |
| // println(gridTraveler(3, 3, Map.empty)) | |
| println(gridTraveler(18, 18, collection.mutable.Map.empty)) | |
| } |
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