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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🎄 - 2025 DAY 4 SOLUTIONS - 🎄 (programming.dev)

submitted 2 weeks ago by CameronDev@programming.dev to c/advent_of_code@programming.dev

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Day 4: Printing Department

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[–] Quant@programming.dev 2 points 2 weeks ago

Uiua

Quite simple this one. Part 2 still takes a few seconds because I'm essentially checking off each roll individually.

Run with example input

Code

$ ..@@.@@@@.
$ @@@.@.@.@@
$ @@@@@.@.@@
$ @.@@@@..@.
$ @@.@@@@.@@
$ .@@@@@@@.@
$ .@.@.@.@@@
$ @.@@@.@@@@
$ .@@@@@@@@.
$ @.@.@@@.@.
⊜∘⊸≠@\n
=@@

Rolls ← ⍣(⧻⊚˙⍤)∞⊸⊡1_1
Removable ← (
  ⬚0⧈Rolls[3_3 1_1 1_1]
  ⊚≤4
)

Remove ← ⍜⊡(˜↯0⧻)

PartOne ← ⧻Removable

PartTwo ← (
  ⊙0
  ⍥(
    ⊙(⊙+⟜⧻)⟜Removable
    ˜Remove
  )∞
  ◌
)
&pf "Part One: "
&p ⊸PartOne

&pf "Part Two: "
&p PartTwo

Old Part 2

Before seeing mykl's solution this was my solution for part 2

PartTwoOld ← (
  0⊙0
  ⍢(⊙⊙◌
    ⊙⊸Removable
    +⊙⊸⧻
    ⊙⊸Remove
  | ¬≍◌)
  ⊙⋅◌
)

It's basically the same, just that I used a while-do-loop, making the check for the ending condition myself (which took me a bit to get right because I still find loops in Uiua a bit confusing).
Using the repeat-loop as above also gets rid of the dip's (⊙). I could've removed them here as well but I was already deep in the trouble of getting the loop to work correctly and I liked the little face at the beginning 0⊙0