From 80214746888e5edf1c585a1991bd000c82328036 Mon Sep 17 00:00:00 2001 From: Guillaume Dott Date: Mon, 22 Nov 2021 13:47:55 +0100 Subject: [PATCH] Resolve day 3 --- 3/input | 1 + 3/script.rb | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 99 insertions(+) create mode 100644 3/input create mode 100755 3/script.rb diff --git a/3/input b/3/input new file mode 100644 index 0000000..03504fc --- /dev/null +++ b/3/input @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/3/script.rb b/3/script.rb new file mode 100755 index 0000000..5106d5d --- /dev/null +++ b/3/script.rb @@ -0,0 +1,98 @@ +#!/usr/bin/env ruby + +require_relative '../common' + +class Grid + def initialize(robosanta: false) + @robosanta = robosanta + + @santa_position = Position.new + @robosanta_position = Position.new + + @grid = Hash.new(0) + + give_from_santa + give_from_robosanta + end + + def houses_count + @grid.size + end + + def move_santa(direction) + @santa_position.move direction + give_from_santa + end + + def move_robosanta(direction) + @robosanta_position.move direction + give_from_robosanta + end + + def give_from_santa + @grid[@santa_position.position] += 1 + end + + def give_from_robosanta + return unless @robosanta + @grid[@robosanta_position.position] += 1 + end +end + +class Position + attr_accessor :position + + def initialize + self.position = [0, 0] + end + + def move(direction) + case direction + when '^' + up + when 'v' + down + when '<' + left + when '>' + right + end + end + + def up + self.position = [position[0] - 1, position[1]] + end + + def down + self.position = [position[0] + 1, position[1]] + end + + def left + self.position = [position[0], position[1] - 1] + end + + def right + self.position = [position[0], position[1] + 1] + end +end + +def part1 + Input.new(__dir__).readlines.join.chars.each_with_object(Grid.new) do |direction, grid| + grid.move_santa direction + end.houses_count +end + +def part2(input) + input.chars.each_with_object(Grid.new(robosanta: true)).with_index do |(direction, grid), i| + if i.even? + grid.move_santa direction + else + grid.move_robosanta direction + end + end.houses_count +end + +puts "=== Part 1 ===" +puts part1 +puts "=== Part 2 ===" +puts part2(Input.new(__dir__).readlines.join)