tvl-depot/users/sterni/exercises/aoc/2022/09/9.bqn

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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 r0;
𝕊 "U"u: 𝕊 0u;
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<00) Step` ExpandStep¨ 𝕩}
•Out "day09.1: "•Fmt 2 Visited i
•Out "day09.2: "•Fmt 10 Visited i