Mercurial > repos > other > adventofcode2023
annotate day4.rb @ 21:46fb65f2cb94
Add Day 14 part 1 implementation
If you look at columns and see "how far can this go" then the
weight is just the sum of the partial triangle numbers of
highest_weight to highest_weight minus number of rocks that
can roll up to there.
Part 2 seems to involve actually moving the rocks, though!
author | IBBoard <dev@ibboard.co.uk> |
---|---|
date | Sat, 16 Dec 2023 10:29:36 +0000 |
parents | 9da7a71b313d |
children |
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 |