Mercurial > repos > other > adventofcode2023
comparison 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> |
|---|---|
| date | Fri, 01 Dec 2023 20:00:22 +0000 |
| parents | |
| children |
comparison
equal
deleted
inserted
replaced
| -1:000000000000 | 0:76cc43966538 |
|---|---|
| 1 #! /usr/bin/env ruby | |
| 2 | |
| 3 if ARGV.length != 1 | |
| 4 abort("Incorrect arguments - pass a single file") | |
| 5 elsif not File.exist? (ARGV[0]) | |
| 6 abort ("File #{ARGV[0]} did not exist") | |
| 7 end | |
| 8 | |
| 9 file = ARGV[0] | |
| 10 sum = 0 | |
| 11 File.open(file, "r").each_line do |line| | |
| 12 match = /^[^0-9]*([0-9]).*?(([0-9])[^0-9]*)?$/.match(line) | |
| 13 if match | |
| 14 first_num = match[1].to_i | |
| 15 second_num = match[3].nil? ? first_num : match[3].to_i | |
| 16 sum += (first_num * 10) + second_num | |
| 17 end | |
| 18 end | |
| 19 | |
| 20 puts sum |