130 lines
2.4 KiB
Plaintext
130 lines
2.4 KiB
Plaintext
data List = { Nil, Cons Nat List }
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data Bool = { True, False }
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data Nat = { O, S Nat }
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defn ifN c t e = {
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case c of {
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True -> { t }
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False -> { e }
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}
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}
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defn ifL c t e = {
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case c of {
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True -> { t }
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False -> { e }
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}
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}
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defn toInt n = {
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case n of {
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O -> { 0 }
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S np -> { 1 + toInt np }
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}
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}
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defn lte n m = {
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case m of {
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O -> {
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case n of {
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O -> { True }
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S np -> { False }
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}
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}
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S mp -> {
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case n of {
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O -> { True }
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S np -> { lte np mp }
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}
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}
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}
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}
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defn minus n m = {
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case m of {
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O -> { n }
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S mp -> {
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case n of {
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O -> { O }
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S np -> {
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minus np mp
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}
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}
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}
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}
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}
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defn mod n m = {
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ifN (lte m n) (mod (minus n m) m) n
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}
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defn notDivisibleBy n m = {
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case (mod m n) of {
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O -> { False }
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S mp -> { True }
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}
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}
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defn filter f l = {
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case l of {
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Nil -> { Nil }
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Cons x xs -> { ifL (f x) (Cons x (filter f xs)) (filter f xs) }
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}
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}
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defn map f l = {
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case l of {
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Nil -> { Nil }
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Cons x xs -> { Cons (f x) (map f xs) }
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}
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}
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defn nats = {
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Cons (S (S O)) (map S nats)
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}
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defn primesRec l = {
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case l of {
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Nil -> { Nil }
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Cons p xs -> { Cons p (primesRec (filter (notDivisibleBy p) xs)) }
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}
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}
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defn primes = {
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primesRec nats
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}
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defn take n l = {
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case l of {
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Nil -> { Nil }
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Cons x xs -> {
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case n of {
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O -> { Nil }
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S np -> { Cons x (take np xs) }
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}
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}
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}
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}
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defn head l = {
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case l of {
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Nil -> { O }
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Cons x xs -> { x }
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}
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}
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defn reverseAcc a l = {
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case l of {
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Nil -> { a }
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Cons x xs -> { reverseAcc (Cons x a) xs }
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}
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}
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defn reverse l = {
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reverseAcc Nil l
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}
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defn main = {
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toInt (head (reverse (take ((S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S (S O))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) primes)))
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}
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