Resolve day 7 and 8

This commit is contained in:
Guillaume Dott 2022-12-08 15:03:36 +01:00
parent 6078e7b72a
commit 7a2d757d60
4 changed files with 1244 additions and 0 deletions

1017
07/input Normal file

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07/script.rb Executable file
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#!/usr/bin/env ruby
require_relative '../common'
class Day07 < Day
class Tree
attr_reader :tree
def self.parse(input)
input.each_with_object(Tree.new) do |command, tree|
if command.start_with?('$ ')
cmd, directory = command.match(/\A\$ (cd|ls) ?([A-Za-z\/.]*)\z/).captures
tree.cd directory if cmd == "cd"
else
if command.start_with?('dir ')
tree.directory command.split.last
else
size, file = command.match(/\A([0-9]+) (.+)\z/).captures
tree.file file, size
end
end
end
end
def initialize
@current_directory = []
@tree = {}
end
def cd(directory)
if directory == ".."
@current_directory.pop
else
@current_directory << directory
if @tree.dig(*@current_directory).nil?
@current_directory.inject(@tree) do |tree, directory|
tree[directory] = {} if tree[directory].nil?
tree[directory]
end
end
end
end
def directory(name)
@tree.dig(*@current_directory)[name] = {}
end
def file(name, size)
@tree.dig(*@current_directory)[name] = size.to_i
end
def sizes(directory = ["/"])
@tree.dig(*directory).each_with_object({directory.join('/') => 0}) do |(name, content), res|
if content.is_a?(Hash)
res.merge!(sizes(directory + [name]))
res[directory.join('/')] += res[(directory + [name]).join('/')]
else
res[directory.join('/')] += content
end
end
end
end
def part1
Tree.parse(stdin).sizes.values.select { |v| v <= 100000 }.sum
end
def part2
Tree.parse(stdin).sizes.values.select { |v| v >= 8381165 }.min
end
end
Day07.run

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08/script.rb Executable file
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#!/usr/bin/env ruby
require_relative '../common'
class Day08 < Day
def part1
grid = stdin.map { |r| r.chars.map(&:to_i) }
grid.each_with_index.inject(0) do |visible, (row, i)|
visible + row.each_with_index.inject(0) do |row_visible, (tree, j)|
if i == 0 || i == grid.size - 1 || j == 0 || j == row.size - 1 ||
[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 }
row_visible + 1
else
row_visible
end
end
end
end
def part2
grid = stdin.map { |r| r.chars.map(&:to_i) }
grid.each_with_index.inject(0) do |max_scenic_score, (row, i)|
scenic_score = row.each_with_index.inject(0) do |max_scenic_score_row, (tree, j)|
scenic_score_row = [
row[0...j].reverse,
row[j + 1..],
grid[0...i].map { |k| k[j] }.reverse,
grid[i + 1..].map { |k| k[j] }
].map do |direction|
taller_tree = direction.detect { |t| t >= tree }
if taller_tree
direction.index(taller_tree) + 1
else
direction.size
end
end.inject(:*)
if scenic_score_row > max_scenic_score_row
scenic_score_row
else
max_scenic_score_row
end
end
if scenic_score > max_scenic_score
scenic_score
else
max_scenic_score
end
end
end
end
Day08.run