ハスケル、19
(\xx@2012->xx)$2012
または、完全なプログラムとして、
29
main=print$(\xx@2012->xx)2012
もう少し楽しみ:
(\l@(_:_:t:[])->t:l)['0'..'2']
単なる実行時エラーを生じるような方法で変更できないものを取得するために、1文字の変更だけでは変更できないリストの長さで情報をエンコードできます。
map(head.show.length)[[(),()],[],[()],[(),()]]
(より安全に)変更可能にするために、数値自体をリスト要素として使用することもできます。コンマがプラスと交換されないように文字列にするだけです。
map(head.show.length)[["2012","2012"],[],["2012"],["2012","2012"]]
この文字列は式の結果であるため、Haskellの怠laのおかげで問題ではなく、それを再度使用することもできます。
64 72
a=map(head.show.length.init)[[a,a,a],[a],[a,a],[a,a,a]]
main=putStrLn a
ここでinit
は、「マイナス1、ただし非負」として機能します。
冗長性スキームに型システムを含めて、1文字の変更で修正
できる方法で番号を書き込むことも
できます...
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"
)
いずれかu
をp
逆に変更することもできますが、それは常に2番目のタプル要素のリストスタックの深さを台無しにし、コンパイル時エラーを引き起こします。
このアイデアをさらに拡張して、テキスト全体をコンパクトにエンコードし、読みやすく編集しやすく、しかも単一の文字を変更しても安全なようにすることができます。
そしてさらに別の...
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