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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🛜 - 2024 DAY 8 SOLUTIONS -🛜 (programming.dev)

submitted 1 week ago by [email protected] to c/[email protected]

30 comments fedilink hide all child comments

Day 8: Resonant Collinearity

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[–] mykl 2 points 1 week ago* (last edited 1 week ago)

Uiua

Getting closer to an elegant solution, but still a way to go...

How to read this

Try it live!

Grid      ← ⊜∘⊸≠@\n "............\n........0...\n.....0......\n.......0....\n....0.......\n......A.....\n............\n............\n........A...\n.........A..\n............\n............"
Pairs     ← ∧(⊂⧅≠2⊚⌕)⊙¤⊸(◴▽⊸≠@.♭)Grid[] # get pairs of nodes in grid (both ways round).
InGrid    ← ▽≡/××<⧻Grid:≥0..            # (posns) Keeps those in range.
AntiNodes ← ↯∞_2≡(+¤⊙(×¤)⊃⊣/-):¤        # (range, pairs) Find antinodes by taking offset, mul by range, add to last node, check it's in grid.
&p ⧻InGrid◴ AntiNodes ↘1⇡2 Pairs
&p ⧻InGrid◴ AntiNodes ↘0⇡50 Pairs