Advent Of Code

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Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2024

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🖨️ - 2024 DAY 5 SOLUTIONS - 🖨️ (programming.dev)

submitted 3 weeks ago by [email protected] to c/[email protected]

57 comments fedilink hide all child comments

Day 5: Print Queue

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[–] [email protected] 4 points 2 weeks ago (2 children)

Uiua

Well it's still today here, and this is how I spent my evening. It's not pretty or maybe even good, but it works on the test data...

spoiler

Uses Kahn's algorithm with simplifying assumptions based on the helpful nature of the data.

Try it here

Data ← ⊜(□)⊸≠@\n "47|53\n97|13\n97|61\n97|47\n75|29\n61|13\n75|53\n29|13\n97|29\n53|29\n61|53\n97|53\n61|29\n47|13\n75|47\n97|75\n47|61\n75|61\n47|29\n75|13\n53|13\n\n75,47,61,53,29\n97,61,53,29,13\n75,29,13\n75,97,47,61,53\n61,13,29\n97,13,75,29,47"
Rs   ← ≡◇(⊜⋕⊸≠@|)▽⊸≡◇(⧻⊚⌕@|)Data
Ps   ← ≡⍚(⊜⋕⊸≠@,)▽⊸≡◇(¬⧻⊚⌕@|)Data

NoPred  ← ⊢▽:⟜(≡(=0/+⌕)⊙¤)◴♭⟜≡⊣                # Find entry without predecessors.
GetLead ← ⊸(▽:⟜(≡(¬/+=))⊙¤)⟜NoPred             # Remove that leading entry.
Rules   ← ⇌⊂⊃(⇌⊢°□⊢|≡°□↘1)[□⍢(GetLead|≠1⧻)] Rs # Repeatedly find rule without predecessors (Kaaaaaahn!).

Sorted   ← ⊏⍏⊗,Rules
IsSorted ← /×>0≡/-◫2⊗°□: Rules
MidVal   ← ⊡:⟜(⌊÷ 2⧻)

⇌⊕□⊸≡IsSorted Ps        # Group by whether the pages are in sort order.
≡◇(/+≡◇(MidVal Sorted)) # Find midpoints and sum.

[–] [email protected] 3 points 2 weeks ago (2 children)

Does this language ever look pretty? Great for signaling UFOs though :D

[–] [email protected] 2 points 2 weeks ago

Those unicode code points won't use themselves.

[–] [email protected] 2 points 2 weeks ago

Ah, but the terseness of the code allows the beauty of the underlying algorithm to shine through :-)

[–] [email protected] 2 points 2 weeks ago* (last edited 2 weeks ago)

Oh my. I just watched yernab's video, and this becomes so much easier:

# Order is totally specified, so sort by number of predecessors,
# check to see which were already sorted, then group and sum each group.
Data ← ⊜(□⊜□⊸≠@\n)⊸(¬⦷"\n\n")"47|53\n97|13\n97|61\n97|47\n75|29\n61|13\n75|53\n29|13\n97|29\n53|29\n61|53\n97|53\n61|29\n47|13\n75|47\n97|75\n47|61\n75|61\n47|29\n75|13\n53|13\n\n75,47,61,53,29\n97,61,53,29,13\n75,29,13\n75,97,47,61,53\n61,13,29\n97,13,75,29,47"
Rs   ← ≡◇(⊜⋕⊸≠@|)°□⊢Data
Ps   ← ≡⍚(⊜⋕⊸≠@,)°□⊣Data
⊕(/+≡◇(⊡⌊÷2⧻.))¬≡≍⟜:≡⍚(⊏⍏/+⊞(∈Rs⊟)..).Ps