Resolve day 7 and 8
This commit is contained in:
parent
6078e7b72a
commit
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72
07/script.rb
Executable file
72
07/script.rb
Executable file
@ -0,0 +1,72 @@
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#!/usr/bin/env ruby
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require_relative '../common'
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class Day07 < Day
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class Tree
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attr_reader :tree
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def self.parse(input)
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input.each_with_object(Tree.new) do |command, tree|
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if command.start_with?('$ ')
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cmd, directory = command.match(/\A\$ (cd|ls) ?([A-Za-z\/.]*)\z/).captures
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tree.cd directory if cmd == "cd"
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else
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if command.start_with?('dir ')
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tree.directory command.split.last
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else
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size, file = command.match(/\A([0-9]+) (.+)\z/).captures
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tree.file file, size
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end
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end
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end
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end
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def initialize
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@current_directory = []
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@tree = {}
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end
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def cd(directory)
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if directory == ".."
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@current_directory.pop
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else
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@current_directory << directory
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if @tree.dig(*@current_directory).nil?
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@current_directory.inject(@tree) do |tree, directory|
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tree[directory] = {} if tree[directory].nil?
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tree[directory]
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end
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end
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end
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end
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def directory(name)
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@tree.dig(*@current_directory)[name] = {}
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end
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def file(name, size)
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@tree.dig(*@current_directory)[name] = size.to_i
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end
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def sizes(directory = ["/"])
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@tree.dig(*directory).each_with_object({directory.join('/') => 0}) do |(name, content), res|
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if content.is_a?(Hash)
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res.merge!(sizes(directory + [name]))
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res[directory.join('/')] += res[(directory + [name]).join('/')]
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else
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res[directory.join('/')] += content
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end
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end
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end
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end
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def part1
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Tree.parse(stdin).sizes.values.select { |v| v <= 100000 }.sum
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end
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def part2
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Tree.parse(stdin).sizes.values.select { |v| v >= 8381165 }.min
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end
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end
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Day07.run
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99
08/input
Normal file
99
08/input
Normal file
@ -0,0 +1,99 @@
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56
08/script.rb
Executable file
56
08/script.rb
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@ -0,0 +1,56 @@
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#!/usr/bin/env ruby
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require_relative '../common'
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class Day08 < Day
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def part1
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grid = stdin.map { |r| r.chars.map(&:to_i) }
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grid.each_with_index.inject(0) do |visible, (row, i)|
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visible + row.each_with_index.inject(0) do |row_visible, (tree, j)|
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if i == 0 || i == grid.size - 1 || j == 0 || j == row.size - 1 ||
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[row[0...j], row[j + 1..], grid[0...i].map { |k| k[j] }, grid[i + 1..].map { |k| k[j] }].map(&:max).any? { |k| k < tree }
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row_visible + 1
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else
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row_visible
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end
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end
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end
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end
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def part2
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grid = stdin.map { |r| r.chars.map(&:to_i) }
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grid.each_with_index.inject(0) do |max_scenic_score, (row, i)|
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scenic_score = row.each_with_index.inject(0) do |max_scenic_score_row, (tree, j)|
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scenic_score_row = [
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row[0...j].reverse,
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row[j + 1..],
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grid[0...i].map { |k| k[j] }.reverse,
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grid[i + 1..].map { |k| k[j] }
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].map do |direction|
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taller_tree = direction.detect { |t| t >= tree }
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if taller_tree
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direction.index(taller_tree) + 1
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else
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direction.size
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end
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end.inject(:*)
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if scenic_score_row > max_scenic_score_row
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scenic_score_row
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else
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max_scenic_score_row
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end
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end
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if scenic_score > max_scenic_score
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scenic_score
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else
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max_scenic_score
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end
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end
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end
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end
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Day08.run
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Reference in New Issue
Block a user