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12.fs
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open System
open System.IO
let stopWatch = System.Diagnostics.Stopwatch.StartNew()
let DEBUG = false
let dbg v =
if DEBUG then
printfn "%A" v
v
let lines = File.ReadAllLines(@"input") |> Array.map Array.ofSeq
let ans1 =
(lines, lines.Length, lines[0].Length)
|||> fun l n m ->
[| 0 .. (n - 1) |]
|> Array.map (fun _ -> Array.create m -1)
|> fun nl ->
(Array.allPairs [| 0 .. (n - 1) |] [| 0 .. (m - 1) |])
|> Array.iter (fun (i, j) ->
match nl[i][j] with
| -1 ->
[ (i, j) ]
|> Array.unfold (fun q ->
match q.Length with
| 0 -> None
| _ ->
match q[0] with
| (a, b) ->
match nl[a][b] <- i * n + j with
| _ ->
Some(
0,
([ (a + 1, b); (a, b + 1); (a - 1, b); (a, b - 1) ]
|> List.filter (fun (X, Y) ->
match X with
| X when X < 0 || X >= n -> false
| _ ->
match Y with
| Y when Y < 0 || Y >= m -> false
| _ ->
match nl[X][Y] with
| -1 ->
match l[X][Y] with
| c when c = l[i][j] -> true
| _ -> false
| _ -> false))
@ q.Tail
))
|> (fun _ -> ())
| _ -> ())
|> fun _ ->
nl
|> Array.mapi (fun i r -> r |> Array.mapi (fun j x -> (x, (i, j))))
|> Array.collect id
|> Array.groupBy fst
|> Array.Parallel.sumBy (fun (_, fg) ->
fg.Length
* (4 * fg.Length
- (Array.allPairs fg fg
|> Array.filter (fun ((_, (i, j)), (_, (x, y))) -> abs (i - x) + abs (j - y) = 1)
|> Array.length)))
let ans2 =
(lines, lines.Length, lines[0].Length)
|||> fun l n m ->
[| 0 .. (n - 1) |]
|> Array.map (fun _ -> Array.create m -1)
|> fun nl ->
(Array.allPairs [| 0 .. (n - 1) |] [| 0 .. (m - 1) |])
|> Array.iter (fun (i, j) ->
match nl[i][j] with
| -1 ->
[ (i, j) ]
|> Array.unfold (fun q ->
match q.Length with
| 0 -> None
| _ ->
match q[0] with
| (a, b) ->
match nl[a][b] <- i * n + j with
| _ ->
Some(
0,
([ (a + 1, b); (a, b + 1); (a - 1, b); (a, b - 1) ]
|> List.filter (fun (X, Y) ->
match X with
| X when X < 0 || X >= n -> false
| _ ->
match Y with
| Y when Y < 0 || Y >= m -> false
| _ ->
match nl[X][Y] with
| -1 ->
match l[X][Y] with
| c when c = l[i][j] -> true
| _ -> false
| _ -> false))
@ q.Tail
))
|> (fun _ -> ())
| _ -> ())
|> fun _ ->
nl
|> Array.mapi (fun i r -> r |> Array.mapi (fun j x -> (x, (i, j))))
|> Array.collect id
|> Array.groupBy fst
|> Array.Parallel.sumBy (fun (c, fg) ->
fg.Length
* (([| 0 .. (m - 1) |]
|> Array.sumBy (fun j ->
[| 0 .. (n - 1) |]
|> Array.filter (fun i ->
match j with
| 0 -> c = nl[i][j]
| _ -> c = nl[i][j] && c <> nl[i][j - 1])
|> fun ro ->
ro |> Array.mapi (fun k v -> (k = 0 || ro[k - 1] + 1 <> v) |> Convert.ToInt32)
|> Array.sum))
+ ([| 0 .. (m - 1) |]
|> Array.sumBy (fun j ->
[| 0 .. (n - 1) |]
|> Array.filter (fun i ->
match j with
| j when j = m - 1 -> c = nl[i][j]
| _ -> c = nl[i][j] && c <> nl[i][j + 1])
|> fun ro ->
ro |> Array.mapi (fun k v -> (k = 0 || ro[k - 1] + 1 <> v) |> Convert.ToInt32)
|> Array.sum))
+ ([| 0 .. (n - 1) |]
|> Array.sumBy (fun i ->
[| 0 .. (m - 1) |]
|> Array.filter (fun j ->
match i with
| 0 -> c = nl[i][j]
| _ -> c = nl[i][j] && c <> nl[i - 1][j])
|> fun ro ->
ro |> Array.mapi (fun k v -> (k = 0 || ro[k - 1] + 1 <> v) |> Convert.ToInt32)
|> Array.sum))
+ ([| 0 .. (n - 1) |]
|> Array.sumBy (fun i ->
[| 0 .. (m - 1) |]
|> Array.filter (fun j ->
match i with
| i when i = n - 1 -> c = nl[i][j]
| _ -> c = nl[i][j] && c <> nl[i + 1][j])
|> fun ro ->
ro |> Array.mapi (fun k v -> (k = 0 || ro[k - 1] + 1 <> v) |> Convert.ToInt32)
|> Array.sum))))
stopWatch.Stop()
printfn "%A %A" ans1 ans2
printfn "Time: %fms" stopWatch.Elapsed.TotalMilliseconds