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feat(sterni/aoc/2022): day09 BQN solution

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Change-Id: Idad006eaacbd89827feb5bbd9d6e04605743fca2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7555
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
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sterni 2022-12-10 19:28:37 +01:00 • committed by clbot
parent 7ce6c7363c
commit 42a4f14878
1 changed files with 17 additions and 0 deletions
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users/sterni/exercises/aoc/2022/09/9.bqn Normal file
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⟨SplitOn,ReadDec⟩ ← •Import "../../lib.bqn"
i ← ReadDec⌾(1⊸⊑)¨ (<' ')⊸SplitOn¨ •FLines "input"
UnitDelta ← (⊢÷(|+0⊸=))
ExpandStep ← {
𝕊 "L"‿l: 𝕊 (-l)‿0;
𝕊 "R"‿r: 𝕊 r‿0;
𝕊 "U"‿u: 𝕊 0‿u;
𝕊 "D"‿d: 𝕊 0‿(-d);
𝕊 delta: ((⌈´|)⥊<∘UnitDelta) delta
}
Step ← {knots 𝕊 delta: {h 𝕊 t: (UnitDelta h-t) +⍟(1<⌈´|h-t) t}` (delta⊸+)⌾⊑ knots}
Visited ← {+´0=⊒(¯1⊸⊑)¨(<𝕨⥊<0‿0) Step` ∾ExpandStep¨ 𝕩}
•Out "day09.1: "∾•Fmt 2 Visited i
•Out "day09.2: "∾•Fmt 10 Visited i