Mercurial > repos > other > adventofcode2023
view day6b.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 | 6e0615e54e71 |
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] time, distance = File.open(file, "r").each_line(chomp: true).map {|v| v.split(":")[1].split(" ").join("").to_i} events = [[time, distance]] product = events.map do |event| mid = (event[0].to_f / 2).floor first_success = (1..mid).bsearch {|i| (event[0] - i) * i > event[1]} num_success = (mid - first_success + 1) * 2 event[0].odd? ? num_success : num_success - 1 end.reduce(:*) puts product