Day 11: Cosmic Expansion
Megathread guidelines
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Uiua
As promised, just a little later than planned. I do like this solution as it’s actually using arrays rather than just imperative programming in fancy dress. Run it here
Grid ← =@# [ "...#......" ".......#.." "#........." ".........." "......#..." ".#........" ".........#" ".........." ".......#.." "#...#....." ] GetDist! ← ( # Build arrays of rows, cols of galaxies ⊙(⊃(◿)(⌊÷)⊃(⧻⊢)(⊚=1/⊂)). # check whether each row/col is just space # and so calculate its relative position ∩(\++1^1=0/+)⍉. # Map galaxy co-ords to these values ⊏:⊙(:⊏ :) # Map to [x, y] pairs, build cross product, # and sum all topright values. /+≡(/+↘⊗0.)⊠(/+⌵-).⍉⊟ ) GetDist!(×1) Grid GetDist!(×99) Grid