Mercurial > repos > other > adventofcode2023
comparison day1b.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 |
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| -1:000000000000 | 0:76cc43966538 |
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| 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 | |
| 12 number_map = { | |
| 13 "one" => 1, | |
| 14 "two" => 2, | |
| 15 "three" => 3, | |
| 16 "four" => 4, | |
| 17 "five" => 5, | |
| 18 "six" => 6, | |
| 19 "seven" => 7, | |
| 20 "eight" => 8, | |
| 21 "nine" => 9 | |
| 22 } | |
| 23 | |
| 24 (1..9).each {|i| number_map[i.to_s] = i} | |
| 25 | |
| 26 File.open(file, "r").each_line do |line| | |
| 27 pos = line.length | |
| 28 value_1 = 0 | |
| 29 number_map.each do |k,v| | |
| 30 index = line.index(k) | |
| 31 if index and index < pos | |
| 32 value_1 = v | |
| 33 pos = index | |
| 34 end | |
| 35 end | |
| 36 pos = line.length | |
| 37 line.reverse! | |
| 38 value_2 = 0 | |
| 39 number_map.each do |k,v| | |
| 40 index = line.index(k.reverse) | |
| 41 if index and index < pos | |
| 42 value_2 = v | |
| 43 pos = index | |
| 44 end | |
| 45 end | |
| 46 sum += (value_1 * 10) + value_2 | |
| 47 end | |
| 48 | |
| 49 puts sum |