Mercurial > repos > other > adventofcode2023
view 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 |
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#! /usr/bin/env ruby require 'set' if ARGV.length != 1 abort("Incorrect arguments - needs input 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(chomp: true) do |line| winning_number_str, our_number_str = line.split(":")[1].split("|").map(&:chomp) winning_numbers = Set.new(winning_number_str.split(" ").map(&:to_i)) our_numbers = Set.new(our_number_str.split(" ").map(&:to_i)) our_winning_numbers = winning_numbers & our_numbers sum += our_winning_numbers.length > 0 ? 2 ** (our_winning_numbers.length - 1) : 0 end puts sum