79 lines
2.6 KiB
Text
79 lines
2.6 KiB
Text
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load "bool.quox"
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load "list.quox"
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load "maybe.quox"
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load "int.quox"
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def0 Int = scheme-int.Int
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def zz = scheme-int.from-ℕ 0
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def step : ω.(List Int) → List Int =
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λ xs ⇒
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list.zip-with-uneven Int Int Int (λ m n ⇒ scheme-int.minus n m)
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xs (list.tail-or-nil Int xs)
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def all-zero : ω.(List Int) → Bool =
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list.foldlω Int Bool 'true (λ b n ⇒ bool.and b (scheme-int.eq n zz))
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def last : 0.(A : ★) → ω.(List A) → Maybe A =
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λ A ⇒ list.foldrω A (Maybe A) (Nothing A) (λ x y ⇒ maybe.or A y (Just A x))
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def0 last-ok : last ℕ (4, 1, 4, 8, 5, 'nil) ≡ Just ℕ 5 : Maybe ℕ =
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δ 𝑖 ⇒ Just ℕ 5
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def last-or-0 : ω.(List Int) → Int =
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λ xs ⇒ maybe.fold Int Int zz (λ x ⇒ x) (last Int xs)
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def next-entry : ω.(List ℕ) → Int =
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λ xs ⇒
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letω fuel = fst xs in
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letω xs = list.map ℕ Int scheme-int.from-ℕ xs in
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let result : Int =
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caseω fuel return ω.(List Int) → Int of {
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0 ⇒ λ _ ⇒ zz;
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succ _, ω.rec ⇒ λ this ⇒
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bool.if Int (all-zero this) zz
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(letω next : List Int = step this in
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letω diff : Int = rec next in
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scheme-int.plus diff (last-or-0 this))
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} xs in
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result
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def sumZ = list.foldr Int Int zz scheme-int.plus
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{-
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def0 ok-1 : next-entry (6, 0, 3, 6, 9, 12, 15, 'nil) ≡ 18 : ℕ = δ _ ⇒ 18
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def0 ok-2 : next-entry (6, 1, 3, 6, 10, 15, 21, 'nil) ≡ 28 : ℕ = δ _ ⇒ 28
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def0 ok-3 : next-entry (6, 10, 13, 16, 21, 30, 45, 'nil) ≡ 68 : ℕ = δ _ ⇒ 68
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-}
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load "io.quox"
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load "string.quox"
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def read-file : ω.String → IO [ω.List (List ℕ)] =
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λ path ⇒
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letω split-lines : ω.String → List String =
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string.split (λ c ⇒ char.eq c char.newline);
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split-numbers : ω.String → List ℕ = λ str ⇒
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let words = string.split char.ws? str in
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list.map String ℕ string.to-ℕ-or-0 words;
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split-file : ω.String → [ω. List (List ℕ)] = λ str ⇒
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[list.mapω String (List ℕ) split-numbers (split-lines str)] in
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io.mapω String [ω.List (List ℕ)] split-file (io.read-fileω path)
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def FILE : String = "in/day9"
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#[main]
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def part1 =
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io.bindω (List (List ℕ)) True
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(read-file FILE)
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(λ lists ⇒ io.dump Int (sumZ (list.mapω (List ℕ) Int next-entry lists)))
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def part2 : IO True =
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letω next-entry-r : ω.(List ℕ) → Int = λ xs ⇒ next-entry (list.reverse ℕ xs) in
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io.bindω (List (List ℕ)) True
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(read-file FILE)
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(λ lists ⇒ io.dump Int (sumZ (list.mapω (List ℕ) Int next-entry-r lists)))
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