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.

AoC 2025

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console.log('Hello World')

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🏃 - 2024 DAY 18 SOLUTIONS - 🏃 (programming.dev)

submitted 1 year ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

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Day 18: Ram Run

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[–] mykl@lemmy.world 2 points 1 year ago* (last edited 1 year ago)

Uiua

I didn't think I could do this in Uiua this morning, but I gave it some thought while walking the dog and managed to wrangle the data into shape tonight. I factored out the binary chop as that seems like another useful tool to have up my sleeve.

EDIT: goddammit, Kai literally snuck a new RC release out just after I posted this, with a breaking change to how path works. Updated version below.

Try it here!

Data  ← ≡◇(⊜⋕⊸≠@,)°/$"_\n_" "5,4\n4,2\n4,5\n3,0\n2,1\n6,3\n2,4\n1,5\n0,6\n3,3\n2,6\n5,1\n1,2\n5,5\n2,5\n6,5\n1,4\n0,4\n6,4\n1,1\n6,1\n1,0\n0,5\n1,6\n2,0"
End   ← 6_6
Count ← 12

D₄      ← [1_0 ¯1_0 0_1 0_¯1]
Valid   ← ▽¬⊸∊:▽⊸(≡/××⊃(≤⊢End|≥0))+D₄¤
BestLen ← ⍣(-1⧻⊢path(Valid|≍End)0_0↙:Data|∞)
Chop!   ← ◌⍢(⨬(⊙◌+1|⊙⊙◌:):⟜^0⌊÷2+,,|>)

&p BestLen Count
&p/$"_,_"⊏:Data-1Chop!(=∞BestLen)Count ⧻Data

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