Mercurial > repos > other > adventofcode2023

annotate day4.rb @ 24:19481b061461

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Implement tilting and cycling for Day 14 part 2 Lots of false starts trying to iterate. Eventually looked for "back in same position" to spot a loop. Then took longer to spot that "same position" isn't necessarily "start position" and loop can be offset!
author IBBoard <dev@ibboard.co.uk>
date Sat, 16 Dec 2023 20:39:02 +0000
parents 9da7a71b313d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
1 #! /usr/bin/env ruby
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
2
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
3 require 'set'
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
4
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
5 if ARGV.length != 1
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
6 abort("Incorrect arguments - needs input file")
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
7 elsif not File.exist? (ARGV[0])
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
8 abort("File #{ARGV[0]} did not exist")
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
9 end
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
10
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
11 file = ARGV[0]
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
12
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
13 sum = 0
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
14 File.open(file, "r").each_line(chomp: true) do |line|
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
15 winning_number_str, our_number_str = line.split(":")[1].split("|").map(&:chomp)
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
16 winning_numbers = Set.new(winning_number_str.split(" ").map(&:to_i))
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
17 our_numbers = Set.new(our_number_str.split(" ").map(&:to_i))
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
18 our_winning_numbers = winning_numbers & our_numbers
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
19 sum += our_winning_numbers.length > 0 ? 2 ** (our_winning_numbers.length - 1) : 0
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
20 end
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
21
9da7a71b313d Implement scratchcard counting for Day 4
IBBoard <dev@ibboard.co.uk>
parents:
diff changeset
22 puts sum