Day 8 cleanup
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08/Main.idr
75
08/Main.idr
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@ -8,14 +8,6 @@ import Debug.Trace
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%default total
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simple = """
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30373
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25512
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65332
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33549
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35390
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"""
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-- Parse a grid of numbers from a string
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parseGrid : String -> Maybe (n ** m ** Vect n (Vect m Nat))
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parseGrid input =
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@ -41,10 +33,6 @@ dropLast : {n : Nat} -> Vect (S n) a -> Vect n a
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dropLast {n = 0} (x :: xs) = xs
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dropLast {n = (S k)} (x :: xs) = x :: dropLast xs
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tagTrace : Show a => String -> a -> a
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tagTrace str =
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traceValBy (\x => str ++ ": " ++ show x)
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-- Check if a tree is visible from the edge of the grid
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checkVisible : {n: Nat} -> {m: Nat} -> (x: Fin n) -> (y: Fin m) -> Vect n (Vect m Nat) -> Bool
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-- If either of the coordinates are zero or the maximum then the tree is on an edge and thus visible
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@ -91,69 +79,6 @@ senicScore x@(FS _) y@(FS _) xs =
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afterVisible = length (takeWhilePlus (< compValue) after)
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in beforeVisible * afterVisible
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showGrid : Vect n (Vect m Nat) -> String
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showGrid xs =
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let lines = map (concatMap show) xs
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in joinBy "\n" (toList lines)
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finPair : (m : Nat) -> (n : Nat) -> (Nat, Nat) -> Maybe (Fin m, Fin n)
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finPair m n (x,y) =
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do a <- natToFin x m
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b <- natToFin y n
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Just (a, b)
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testPart1 : IO ()
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testPart1 =
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case parseGrid simple of
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Nothing => putStrLn "Failed to parse grid"
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Just (m ** n ** grid) =>
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do putStrLn "Grid: "
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putStrLn (showGrid grid)
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putStrLn ""
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case coords m n of
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Nothing => putStrLn "Hardcoded coords were invalid"
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Just cordList => do let testingFn = singleTest m n grid
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traverse_ testingFn cordList
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printLn "Tests Done"
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where coords : (m : Nat) -> (n : Nat) -> Maybe (List ((Fin m, Fin n), Bool))
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coords m n =
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let raw : List ((Nat, Nat), Bool)
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raw = [((1,1), True), ((1, 2), True), ((1, 3), False), ((2, 1), True), ((2, 2), False), ((2, 3), True)]
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in traverse (\(x, y) => map (\z => (z, y)) (finPair m n x)) raw
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singleTest : (m : Nat) -> (n : Nat) -> Vect m (Vect n Nat) -> ((Fin m, Fin n), Bool) -> IO ()
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singleTest m n grid ((x, y), result) =
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do let row = index x grid
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let val = index y row
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putStrLn $ "Coordinate: " ++ show (x,y) ++ " Value: " ++ show val ++ " Expected Visible: " ++ show result
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putStrLn $ "Calculated Visible: " ++ show (checkVisible x y grid) ++ "\n"
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testPart2 : IO ()
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testPart2 =
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case parseGrid simple of
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Nothing => putStrLn "Failed to parse grid"
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Just (m ** n ** grid) =>
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do putStrLn "Grid: "
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putStrLn (showGrid grid)
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putStrLn ""
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case coords m n of
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Nothing => putStrLn "Hardcoded coords were invalid"
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Just cordList => do let testingFn = singleTest m n grid
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traverse_ testingFn cordList
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printLn "Tests Done"
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where coords : (m : Nat) -> (n : Nat) -> Maybe (List ((Fin m, Fin n), Nat))
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coords m n =
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let raw : List ((Nat, Nat), Nat)
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raw = [((1, 2), 4), ((3, 2), 8)]
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in traverse (\(x, y) => map (\z => (z, y)) (finPair m n x)) raw
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singleTest : (m : Nat) -> (n : Nat) -> Vect m (Vect n Nat) -> ((Fin m, Fin n), Nat) -> IO ()
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singleTest m n grid ((x, y), result) =
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do let row = index x grid
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let val = index y row
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putStrLn $ "Coordinate: " ++ show (x,y) ++ " Value: " ++ show val ++ " Expected Score: " ++ show result
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putStrLn $ "Calculated Visible: " ++ show (senicScore x y grid) ++ "\n"
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finRange : {n : Nat} -> List (Fin n)
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finRange {n = 0} = []
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finRange {n = (S k)} = forget (allFins k)
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