Advent Of Code

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An unofficial home for the advent of code community on programming.dev!

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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CameronDev

💿 - 2024 DAY 9 SOLUTIONS -💿 (self.advent_of_code)

submitted 1 month ago* (last edited 1 month ago) by CameronDev to c/advent_of_code

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Day 9: Disk Fragmenter

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[–] [email protected] 4 points 1 month ago* (last edited 1 month ago)

Uiua

Just a port of my Dart solution from earlier really, and it shows, as it takes about 30 seconds on the live data.

(edit: I just noticed the little alien in the code (⋅⋅∘|⋅∘|∘) which is literally flipping the stack (╯°□°)╯︵ ┻━┻!)

How to read this

Try it live!

Data   ← "2333133121414131402"
FS     ← ↙⌊÷2⧻.▽≡⋕:♭⍉⊟⊃(⇡|↯:¯1)⧻.Data  # Build up a map of the FS.
MoveB  ← ⍜(⊡|⋅)⊃(⋅⋅∘|⋅∘|∘) ⊡¯1.:⊢⊚⌕¯1. # Find a space, move block into it.
MoveBs ← ⍢(⍢(↘¯1|=¯1⊣)↘¯1MoveB|>0⧻⊚⌕¯1)

TryMove ← ⨬(◌|∧⍜⊏⇌⍉)/×/>.
MoveFile ← (
  ⊃(⊚⌕↯:¯1⧻|∘)⊚⌕⊙.⊙.         # get posns from, start posn to.
  ⨬(◌◌|TryMove ⊟+⊙◌°⊏,⊢)>0⧻. # check posn to is good, swap.
)
Check ← /+/×⊟⇡⧻.↥0
&p Check MoveBs FS
&p Check ∧MoveFile⇌+1⇡/↥.FS

(edit: improved. Part1 is instant, part2 is about 17sec, but the alien has left)

Data   ← "2333133121414131402"
FS     ← ▽≡⋕:↙⧻:♭⍉⊟⊃(⇡|↯:¯1)⧻..Data # Build up a map of the FS.
Ixs    ← ⊃(⊚¬|⇌⊚)≥0                 # Get indices of space, and of blocks reversed.
SwapBs ← ▽⊸≡/>⍉⊟∩↙⟜:↧∩⧻,,           # Join them where space < block.

Files ← ⇌≡(□⊚)⊞=⇡+1/↥.
Move  ← ∧(⍜⊏⇌)⍉⊟+⇡⧻,⊢ # (tos, froms, fs)
MoveFile ← (
  ⊚⌕⊙,↯:¯1⧻.                # List of possible starts
  ⨬(◌◌|⨬(◌◌|Move)>∩⊢,,)>0⧻. # Only valid, leftwards starts 
)
Check ← /+/×⊟⇡⧻.↥0
&p Check ∧⍜⊏⇌SwapBs⊸Ixs FS
&p Check ∧◇MoveFile Files .FS