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72
2023/day11.rb
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MULTIPLIER = ENV["MULTIPLIER"].to_i || 2
input = ARGF.read.strip
by_row = input.lines.map(&:rstrip).map { |line| line.split("") }
def needs_expand(data)
expand = []
data.each_with_index { |row, i| expand << i if row.all? { |c| c == "." || c == "," } }
expand
end
def print_cosmos(cosmos)
cosmos.each do |line|
puts line.join("")
end
end
# do expansion
row_expand = needs_expand(by_row)
row_expand.reverse.each do |i|
by_row[i] = ("," * by_row[i].length).split("") # add expansion marker
end
by_column = by_row.transpose
col_expand = needs_expand(by_column)
col_expand.reverse.each do |i|
by_column[i] = ("," * by_column[i].length).split("") # add expansion marker
end
cosmos = by_column.transpose
print_cosmos(cosmos)
# find galaxies
galaxies = []
(0...cosmos.first.length).each do |x|
(0...cosmos.length).each do |y|
galaxies << [x, y] if cosmos[y][x] == "#"
end
end
def galaxy_distance(a, b)
(a[0] - b[0]).abs + (a[1] - b[1]).abs
end
def cosmos_at(x, y, cosmos)
cosmos[y][x]
end
distances = galaxies.combination(2).map do |combo|
a, b = combo.sort
distance = galaxy_distance(a, b)
# see how many millions are crossed in x
x_millions = (a[0]..b[0]).filter_map do |x|
loc = cosmos_at(x, a[1], cosmos)
loc if loc == ","
end
# now y component
range = if a[1] > b[1]
b[1]..a[1]
else
a[1]..b[1]
end
y_millions = range.filter_map do |y|
loc = cosmos_at(b[0], y, cosmos)
loc if loc == ","
end
distance + ((x_millions.length + y_millions.length) * MULTIPLIER) - x_millions.length - y_millions.length
end
puts "Sum of distances with multiplier #{MULTIPLIER}: #{distances.sum}"

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2023/input/day11.sample
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2023/input/day11.txt
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