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path: root/aoc/2022/05/part-one.rb
blob: 4e11ce9f63b68a16719737bec3792d710831bcd3 (plain) (blame)
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#!/usr/bin/env ruby
drawing, procedure = ARGF.read.split /\n.*\n\n/
first, *rest = (drawing.split "\n").map { |line| (line.scan /.(.). ?/) }
stacks = (first.zip *rest).map { |stack| stack.join.strip.reverse }
for line in procedure.split "\n"
  n, from, to = (line.scan /\d+/).map &:to_i
  stacks[to - 1] << stacks[from - 1][-n..].reverse
  stacks[from - 1].slice! -n..
end
puts (stacks.map { |stack| stack[-1] }).join