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day17.rb
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day17.rb
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require 'set'
file = File.open("input/day17.txt", "r")
lines = file.readlines
class Position
def initialize(x, y, z, w)
@x = x
@y = y
@z = z
@w = w
end
def neighbours3d()
positions = []
for i in [-1, 0, +1]
for j in [-1, 0, +1]
for k in [-1, 0, +1]
if i == j and j == k and k == 0
next
end
positions.push(Position.new(@x + i, @y + j, @z + k, @w))
end
end
end
return positions
end
def activeNeighbours3dCount(space)
return self.neighbours3d().map{|pos| space[pos]}.count("#")
end
def neighbours()
positions = []
for i in [-1, 0, +1]
for j in [-1, 0, +1]
for k in [-1, 0, +1]
for l in [-1, 0, +1]
if i == j and j == k and k == l and l == 0
next
end
positions.push(Position.new(@x + i, @y + j, @z + k, @w + l))
end
end
end
end
return positions
end
def activeNeighboursCount(space)
return self.neighbours().map{|pos| space[pos]}.count("#")
end
def x
@x
end
def y
@y
end
def z
@z
end
def w
@w
end
def ==(other)
return (@x == other.x and @y == other.y and @z == other.z and @w == other.w)
end
alias eql? ==
def hash
@x.hash ^ @y.hash ^ @z.hash ^ @w.hash
end
def to_s()
return "<x=#{@x} y=#{@y} z=#{@z} w=#{@w}>"
end
end
state = {}
state.default = "."
for i in 0..lines.length-1
chars = lines[i].strip.chars
for j in 0..chars.length-1
state[Position.new(i, j, 0, 0)] = chars[j]
end
end
rounds = 0
prev_state = state
while rounds < 6
new_state = {}
new_state.default = "."
for position, state in prev_state
# puts position, state
# rule 1
activeNeighbours = position.activeNeighboursCount(prev_state) # use 3d for part 1
if state == "#" and (activeNeighbours == 2 or activeNeighbours == 3)
new_state[position] = "#"
end
# rule 2
for neighPosition in position.neighbours # use 3d for part 1
activeNeighbours = neighPosition.activeNeighboursCount(prev_state) # use 3d for part 1
if prev_state[neighPosition] == "." and (activeNeighbours == 3)
new_state[neighPosition] = "#"
end
end
end
prev_state = new_state
rounds += 1
puts "Round ##{rounds} has #{prev_state.values.count("#")} active cubes."
end