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image = ARGF.readlines(chomp: true).map(&:chars)
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empty_rows = image.filter_map.with_index {|row,y| row.all? { _1 == ?. } ? y : nil }
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empty_cols = image.transpose.filter_map.with_index {|col,x| col.all? { _1 == ?. } ? x : nil }
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galaxies = []
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y = x = 0
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image.each.with_index do |row, yy|
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x = 0
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row.each.with_index do |elem, xx|
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galaxies << [y,x] if elem == ?#
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x += 1
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x += 999_999 if empty_cols.include?(xx)
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end
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y += 1
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y += 999_999 if empty_rows.include?(yy)
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end
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p galaxies.combination(2).sum {|a, b|
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a.zip(b).sum { (_1 - _2).abs }
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}
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# original part one
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# image = ARGF.read
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# image.gsub!(/^(\.+)$/m, "\\1\n\\1")
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# image = image.split("\n").map(&:chars).transpose.map(&:join).join("\n")
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# image.gsub!(/^(\.+)$/m, "\\1\n\\1")
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# image = image.split("\n").map(&:chars)
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# galaxies = image.flat_map.with_index {|row, y|
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# row.filter_map.with_index {|elem, x| elem == ?# ? [y,x] : nil }
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# }
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# p galaxies.combination(2).sum {|a, b|
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# a.zip(b).sum { (_1 - _2).abs }
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# }
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