Mercurial > repos > other > adventofcode2023
annotate day6b.rb @ 8:51e5f26dc81e
Add a template file for reuse
author | IBBoard <dev@ibboard.co.uk> |
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date | Thu, 07 Dec 2023 19:41:46 +0000 |
parents | 6e0615e54e71 |
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6e0615e54e71
Restructure input parsing for day6b
IBBoard <dev@ibboard.co.uk>
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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]) |
6e0615e54e71
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6 abort("File #{ARGV[0]} did not exist") |
6e0615e54e71
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IBBoard <dev@ibboard.co.uk>
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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 time, distance = File.open(file, "r").each_line(chomp: true).map {|v| v.split(":")[1].split(" ").join("").to_i} |
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12 events = [[time, distance]] |
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13 |
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14 product = events.map do |event| |
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15 mid = (event[0].to_f / 2).floor |
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16 first_success = (1..mid).bsearch {|i| (event[0] - i) * i > event[1]} |
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17 num_success = (mid - first_success + 1) * 2 |
6e0615e54e71
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18 event[0].odd? ? num_success : num_success - 1 |
6e0615e54e71
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19 end.reduce(:*) |
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20 |
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21 puts product |