Advent Of Code

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An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!

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.

Everybody Codes is another collection of programming puzzles with seasonal events.

EC 2025

AoC 2025

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console.log('Hello World')

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🎄 - 2025 DAY 5 SOLUTIONS - 🎄 (programming.dev)

submitted 11 months ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

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Day 5: Cafeteria

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[–] mykl@lemmy.world 4 points 11 months ago

Uiua

It took me a while to work out the merging of ranges, but I'm very pleased with the solution.

Run it here

D ← "3-5\n10-14\n16-20\n12-18\n\n1\n5\n8\n11\n17\n32"
# D ← &fras"2025day05.txt" # drop your input file on this pane and uncomment this line to test against your own data.

Parse ← ∩(⊜⋕⊸∊+@0⇡10)°□₂⊜□¬⊸⦷"\n\n"

Merge ← ⨬(
  ⨬(⊟        # -> distinct, keep both.
  | ⊂⊢⟜(↥∩⊣) # -> overlap, merge them.
  )◡(≤⊓⊣⊢)
| ⊙◌ # -> inside, ignore it.
)◡(≤∩⊣)

Ranges ← ⊙◌⍥⍜⊣(Merge⊙°⊂)◡⋅⧻⊃↙↘1⍆↯∞_2 # Merge pairs of ranges.

P₁ ← /+≡⌞(/↥≡⌟(↧⊓⌟≥≤°⊟))
P₂ ← /+≡(+1/-)⊙◌
⊃P₁ P₂ Ranges Parse D

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