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comparison day2b.rb @ 1:49dd1ae93696

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Implement day 2 with map and reduce
author IBBoard <dev@ibboard.co.uk>
date Sat, 02 Dec 2023 16:16:58 +0000
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0:76cc43966538 1:49dd1ae93696
1 #! /usr/bin/env ruby
2
3 if ARGV.length != 1
4 abort("Incorrect arguments - needs input file")
5 elsif not File.exist? (ARGV[0])
6 abort("File #{ARGV[0]} did not exist")
7 end
8
9 file = ARGV[0]
10
11 sum = 0
12 File.open(file, "r").each_line do |line|
13 _, all_picks = line.split(":")
14 sum += all_picks.split(";").map do |pick|
15 pick.split(",").to_h { |colour_pick| colour_pick.strip.split(" ").reverse }.transform_values(&:to_i)
16 end.reduce(Hash.new) {|reduced,obj| reduced.merge(obj) { |key,val1,val2| val1 > val2 ? val1 : val2 }}.values.reduce(1, :*)
17 end
18
19 puts sum