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21
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1 #! /usr/bin/env ruby
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2
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3 if ARGV.length != 1
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4 abort("Incorrect arguments - needs input file")
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5 elsif not File.exist? (ARGV[0])
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6 abort("File #{ARGV[0]} did not exist")
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7 end
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8
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9 file = ARGV[0]
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10
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11 platform = File.open(file, "r").each_line(chomp: true).map {|row| row.each_char.to_a}.to_a.transpose()
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12
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13 COL_SIZE = platform[0].length
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14
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15 chunked_platform = platform.map {|col| col.chunk_while {|i, j| i != "#"}.to_a}
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16 total_load = chunked_platform.reduce(0) do |weight, col|
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17 _, col_weight = col.reduce([COL_SIZE, 0]) do |accum, chunk|
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18 first_obj_weight, temp_weight = accum
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19 num_moved_objs = chunk.count("O")
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20 last_obj_weight = first_obj_weight - num_moved_objs
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21 temp_weight += ((first_obj_weight * (first_obj_weight + 1)) / 2) - ((last_obj_weight * (last_obj_weight + 1)) / 2)
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22 first_obj_weight -= chunk.length
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23 [first_obj_weight, temp_weight]
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24 end
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25 weight + col_weight
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26 end
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27 puts total_load |
