Mercurial > repos > other > adventofcode2023
view day8.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> |
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date | Sat, 16 Dec 2023 10:29:36 +0000 |
parents | a7fb64b48830 |
children |
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#! /usr/bin/env ruby 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] lines = File.open(file, "r").each_line(chomp: true) steps = lines.first.each_char.to_a.cycle node_lines = lines.drop(1).to_a #first_node, _ = node_lines[0].split("=") #first_node.strip! nodes = node_lines.map {|line| node, rest = line.split("="); left, right = rest.split(","); [node.strip, {"L" => left.strip[1..-1], "R" => right.strip[0..-2]}]}.to_h cur_node = "AAA" step_count = 0 while cur_node != "ZZZ" step_count += 1 cur_node = nodes[cur_node][steps.next] end puts step_count