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November 7, 2013 14:00
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CodeIQ カボチャの種を数えて! https://codeiq.jp/ace/ozy_halloween/q516 の解答
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module Main where | |
(^..^) = QB | |
($^-^) = Mami | |
(@.@=) = Charlotte | |
(?) = App | |
main = print $ eval | |
(((^..^)?((((^..^)?(@.@=))?((($^-^)?((((^..^)?((((^..^) | |
?((((^..^)?((((^..^)?((((^..^)?(@.@=))?((($^-^)?((((^..^) | |
?((((^..^)?((($^-^)?(^..^))))?((((^..^)?((($^-^)?($^-^)))) | |
?((((^..^)?((($^-^)?(^..^))))?((((^..^)?((($^-^)?(((^..^) | |
?((($^-^)?(^..^))))))))?((((^..^)?((((^..^)?((($^-^) | |
?(^..^))))?((((^..^)?((($^-^)?(((^..^)?((($^-^)?(^..^)))))))) | |
?((((^..^)?((($^-^)?(((^..^)?((($^-^)?($^-^)))))))) | |
?((((^..^)?((((^..^)?((($^-^)?(^..^))))?((((^..^)?((($^-^) | |
?($^-^))))?(@.@=))))))?((($^-^)?(@.@=))))))))))))?((($^-^) | |
?((($^-^)?(@.@=))))))))))))))))?((($^-^)?((((^..^)?((($^-^) | |
?($^-^))))?((((^..^)?((($^-^)?($^-^))))?(@.@=)))))))))))))) | |
?((($^-^)?((($^-^)?($^-^))))))))?((($^-^)?(@.@=)))))) | |
?((($^-^)?(@.@=))))))?((($^-^)?((((^..^)?((($^-^)?(((^..^) | |
?((((^..^)?((($^-^)?(^..^))))?((((^..^)?((($^-^)?($^-^)))) | |
?(@.@=))))))))))?((((^..^)?((((^..^)?((($^-^)?(^..^)))) | |
?((((^..^)?((($^-^)?(((^..^)?((($^-^)?(^..^)))))))) | |
?((((^..^)?((($^-^)?(((^..^)?((($^-^)?($^-^)))))))) | |
?((((^..^)?((((^..^)?((($^-^)?(^..^))))?((((^..^)?((($^-^) | |
?($^-^))))?(@.@=))))))?((($^-^)?(@.@=))))))))))))?((($^-^) | |
?((($^-^)?(@.@=))))))))))))))))))?((($^-^)?((($^-^) | |
?(@.@=)))))) | |
"QQQQOQQQOO\ | |
\OQOOOQQQQQ\ | |
\OQQOQQOQOO\ | |
\QQOOOOQQQO\ | |
\QQOOQQOQQO\ | |
\QOQOOOQOOQ\ | |
\OOOQQOQQOQ\ | |
\OQQQOOQOOQ\ | |
\QQOOOQOOQO\ | |
\OQQOQOOQOQ" | |
data Expr = | |
QB | Mami | Charlotte | | |
App Expr Expr | | |
Fun (Expr -> Expr) | | |
Num Int | | |
List [Char] | |
fun :: Expr -> Expr | |
fun QB = Fun $ \x -> Fun $ \y -> Fun $ \z -> (x `App` z) `App` (y `App` z) | |
fun Mami = Fun $ \x -> Fun $ \y -> x | |
fun Charlotte = Fun $ \x -> x | |
fun (a `App` b) = fun a `App` fun b | |
fun (Num 0) = Fun $ \f -> Fun $ \x -> x | |
fun (Num n) = Fun $ \f -> Fun $ \x -> f `App` (fun (Num $ n-1) `App` f `App` x) | |
fun (List []) = Fun $ \f -> Fun $ \n -> n | |
fun (List (h:t)) = | |
Fun $ \f -> Fun $ \n -> | |
f `App` (fun $ unChar h) `App` (fun (List t) `App` f `App` n) | |
where | |
unChar = Num . fromEnum | |
num e = unExpr $ eval' $ e `App` succ `App` (Num 0) | |
where | |
succ = Fun $ \e -> case eval' e of Num n -> Num (n+1) | |
eval' (Fun f `App` e) = eval' $ f e | |
eval' (a `App` b) = eval' $ (eval' a) `App` b | |
eval' e = e | |
unExpr (Num n) = n | |
eval e s = num $ fun $ e `App` List s |
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