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view day1.rb @ 0:76cc43966538
Start https://adventofcode.com/2023/day/1 in Ruby
Part B was nasty because it didn't explain how to handle
overlapping numbers, which was occasionally important for
the last number.
author | IBBoard <dev@ibboard.co.uk> |
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date | Fri, 01 Dec 2023 20:00:22 +0000 |
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#! /usr/bin/env ruby if ARGV.length != 1 abort("Incorrect arguments - pass a single file") elsif not File.exist? (ARGV[0]) abort ("File #{ARGV[0]} did not exist") end file = ARGV[0] sum = 0 File.open(file, "r").each_line do |line| match = /^[^0-9]*([0-9]).*?(([0-9])[^0-9]*)?$/.match(line) if match first_num = match[1].to_i second_num = match[3].nil? ? first_num : match[3].to_i sum += (first_num * 10) + second_num end end puts sum