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Day 4: Ceres Search

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

Uiua

This one was nice. The second part seemed quite daunting at first but wasn't actually that hard in the end.

Run with example input here

Row    ← βŒ• "XMAS"
RevRow ← βŒ•"SAMX"
Sum    ← /+/+
Count  ← +∩SumβŠƒRow RevRow

PartOne ← (
  &rs ∞ &fo "input-4.txt"
  βŠœβˆ˜β‰ @\n.
  βŠ™+⟜∩CountβŸœβ‰ # horizontal and vertical search
  ⟜(/+⧈(Countβ‰β‰‘β¬š@ ↻⇑⧻.)4)
  /+⧈(Countβ‰β‰‘β¬š@ ↻¯⇑⧻.)4
  ++
)

Mask ← Β°βŠšΓ—2⇑5
# Create variations of X-MAS
Vars ← (
  ["M S"
   " A "
   "M S"]
  ≑♭[βˆ©βŸœβ‰]β‰‘β‡Œ.
  Mask
  ⊏0βŠžβ–½Β€
)

PartTwo ← (
  &rs ∞ &fo "input-4.txt"
  βŠœβˆ˜β‰ @\n.
  ⧈(/+β™­βŠžβ‰βŠ™Β€Varsβ–½Maskβ™­)3_3
  Sum
)

&p "Day 4:"
&pf "Part 1: "
&p PartOne
&pf "Part 2: "
&p PartTwo
this post was submitted on 04 Dec 2024
16 points (94.4% liked)

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