Day 9: Disk Fragmenter
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FAQ
- What is this?: Here is a post with a large amount of details: https://programming.dev/post/6637268
- Where do I participate?: https://adventofcode.com/
- Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465
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