Mercurial > repos > other > adventofcode2023
annotate day4.rb @ 20:fac484765bc9
Implement Day 13 mirror line finding
Walking in a loop didn't work, but consecutive pairs give a great
starting point. And there might even be a more Ruby-ish version
of the WHILE loop using zip, reverse and array ranges.
author | IBBoard <dev@ibboard.co.uk> |
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date | Wed, 13 Dec 2023 20:32:13 +0000 |
parents | 9da7a71b313d |
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1 #! /usr/bin/env ruby |
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2 |
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3 require 'set' |
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4 |
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5 if ARGV.length != 1 |
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6 abort("Incorrect arguments - needs input file") |
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7 elsif not File.exist? (ARGV[0]) |
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8 abort("File #{ARGV[0]} did not exist") |
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9 end |
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10 |
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11 file = ARGV[0] |
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12 |
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13 sum = 0 |
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14 File.open(file, "r").each_line(chomp: true) do |line| |
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15 winning_number_str, our_number_str = line.split(":")[1].split("|").map(&:chomp) |
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16 winning_numbers = Set.new(winning_number_str.split(" ").map(&:to_i)) |
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17 our_numbers = Set.new(our_number_str.split(" ").map(&:to_i)) |
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18 our_winning_numbers = winning_numbers & our_numbers |
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19 sum += our_winning_numbers.length > 0 ? 2 ** (our_winning_numbers.length - 1) : 0 |
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20 end |
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21 |
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22 puts sum |