Haskell, 19
(\xx@2012->xx)$2012
ou, como um programa completo,
29
main=print$(\xx@2012->xx)2012
Para um pouco mais divertido:
(\l@(_:_:t:[])->t:l)['0'..'2']
Para obter um que não possa ser modificado de maneira a gerar apenas um erro de tempo de execução, podemos codificar as informações nos comprimentos das listas que não podem ser modificadas usando apenas alterações de um caractere, ou seja,
map(head.show.length)[[(),()],[],[()],[(),()]]
Para torná-lo mais modificável (com segurança), também podemos usar o próprio número como elemento de lista - basta criar strings para impedir a troca de vírgulas por mais ':
map(head.show.length)[["2012","2012"],[],["2012"],["2012","2012"]]
Como essa string é apenas o resultado da expressão, também podemos substituí-la novamente por isso - não é um problema, graças à preguiça de Haskell
64 72
a=map(head.show.length.init)[[a,a,a],[a],[a,a],[a,a,a]]
main=putStrLn a
Os init
atos como "um menos, mas não negativo" aqui.
Também podemos incluir o sistema de tipos no esquema de redundância e, em seguida, escrever o número de uma maneira que
possa ser modificada com alterações de um caractere ...
u :: Enum a => (a,[b])->(a,b)
u(a,[b]) = (succ a , b)
p :: (a,b)->(a,[b])
p(a,b) = (a,[b])
ι :: (Int,()) -- Integral type to make sure you can't make it 0/0
ι = (\n -> (n-n,()))0
twothousandandtwelve = map(head.show.fst) [ u.p.u.p$ι , ι , u.p$ι , u.p.u.p$ι ]
( GHCi> twothousandandtwelve
≡>"2012"
)
Agora você pode alterar qualquer um u
parap
vice-versa, mas isso sempre atrapalha a profundidade dos empilhamento de listas no segundo elemento da tupla e, assim, desencadeia um erro em tempo de compilação.
Essa idéia poderia ser expandida ainda mais, de forma que textos inteiros pudessem ser codificados de maneira compacta, fácil de ler e editar e ainda protegidos da modificação de caracteres únicos.
E mais um ...
main = print N2012
data Counter = Τv |Πy |Υj |Cε |Ho |Φϑ |Ωm |Sg |Πl |Pt |Yϑ |Γσ |Km |Φz |Εα |Av |Ζρ |Ηρ |Εv |Κs |Rζ |Γϑ |Οc |Dι |Rυ |Λd |Bγ |Wt |Xε |Ωη |Ιa |Hζ |Ed |Qj |Wπ |Κw |Qu |Γο |Oι |Mσ |Ωκ |Yg |Kυ |Aj |Du |Λζ |Nζ |Θτ |Pε |Yf |Βa |Τγ |Qx |Jη |Pδ |Iq |Ωn |Fv |Kl |Ψη |Δj |Θσ |Hd |Θq |Υs |Ht |Fρ |Jh |Lζ |Hμ |Υι |Ρζ |Ρv |Dυ |Wo |Iχ |Iζ |Γy |Kr |Sσ |Iμ |Μο |Xw |Εμ |Cσ |Yξ |Aq |Jf |Hσ |Oq |Hq |Nυ |Lo |Jκ |Ρz |Οk |Θi |Θα |Αη |Gh |Lξ |Jm |Ων |Zu |Μc |Qη |Κγ |Αψ |Χζ |Hρ |Γρ |Uϑ |Rj |Χγ |Rw |Mω |Πζ |Θρ |Ωd |Υh |Nt |Tη |Qψ |Θω |Εχ |Iw |Σx |Ηn |Mτ |Xt |Yx |Φε |Hh |Wη |Mf |Ψχ |Νγ |Βξ |Aϑ |Qp |Τϑ |Φm |Uy |Gy |Cd |Bχ |Λl |Οτ |Εa |Df |Li |Aι |Yi |Νκ |Vc |Γx |Φρ |Φp |Nξ |Kf |Tw |Λξ |Φn |Λa |Oψ |Υχ |Fψ |Xω |Τq |Οσ |Σj |Θψ |Το |Νr |Ιπ |Τi |Dτ |Φf |Μn |Χm |Ηε |Wa |Αχ |Uδ |Λf |Ρu |Qk |Wα |Uρ |Τζ |Lg |Qy |Τν |Jϑ |Βδ |Mε |Μι |Πβ |Bη |Eκ |Κz |Ηh |Fδ |Σp |Εγ |Qφ |Μτ |Νχ |Ψν |Pw |Χz |Εϑ |We |Nπ |Tυ |Wg |Bh |Tρ |Ζν |Λm |Ag |Dσ |Πι
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| N2012 deriving(Enum); instance Show Counter where show = show . fromEnum