99 lines
1.7 KiB
Ruby
99 lines
1.7 KiB
Ruby
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#!/usr/bin/env ruby
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require_relative '../common'
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class Grid
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def initialize(robosanta: false)
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@robosanta = robosanta
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@santa_position = Position.new
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@robosanta_position = Position.new
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@grid = Hash.new(0)
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give_from_santa
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give_from_robosanta
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end
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def houses_count
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@grid.size
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end
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def move_santa(direction)
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@santa_position.move direction
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give_from_santa
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end
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def move_robosanta(direction)
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@robosanta_position.move direction
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give_from_robosanta
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end
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def give_from_santa
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@grid[@santa_position.position] += 1
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end
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def give_from_robosanta
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return unless @robosanta
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@grid[@robosanta_position.position] += 1
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end
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end
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class Position
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attr_accessor :position
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def initialize
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self.position = [0, 0]
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end
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def move(direction)
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case direction
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when '^'
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up
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when 'v'
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down
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when '<'
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left
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when '>'
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right
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end
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end
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def up
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self.position = [position[0] - 1, position[1]]
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end
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def down
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self.position = [position[0] + 1, position[1]]
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end
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def left
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self.position = [position[0], position[1] - 1]
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end
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def right
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self.position = [position[0], position[1] + 1]
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end
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end
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def part1
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Input.new(__dir__).readlines.join.chars.each_with_object(Grid.new) do |direction, grid|
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grid.move_santa direction
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end.houses_count
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end
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def part2(input)
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input.chars.each_with_object(Grid.new(robosanta: true)).with_index do |(direction, grid), i|
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if i.even?
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grid.move_santa direction
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else
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grid.move_robosanta direction
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end
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end.houses_count
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end
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puts "=== Part 1 ==="
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puts part1
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puts "=== Part 2 ==="
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puts part2(Input.new(__dir__).readlines.join)
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