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Day 16

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Alexander Munch-Hansen 2018-01-09 13:55:32 +01:00
parent d7d1ed86db
commit d411fd9e6f
2 changed files with 56 additions and 0 deletions
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23
16-1.rb Normal file
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input = File.read("input-16.txt").strip.split(",")
#input = "s1,x3/4,pe/b".split(",")
matcher = /([s,p,x])(?:(\w*\/\w*)|(\w+))/
line = ('a'..'p').to_a
#line = ('a'..'e').to_a
input.each do |s|
match_data = (s.match matcher).to_a
match_data[1] = match_data[1].to_sym
case match_data[1]
when :s
line.rotate! -(match_data[3].to_i)
when :x
positions = match_data[2].split "/"
line[positions[0].to_i], line[positions[1].to_i] = line[positions[1].to_i], line[positions[0].to_i]
when :p
buds = match_data[2].split "/"
index_0, index_1 = line.find_index(buds[0]), line.find_index(buds[1])
line[index_0], line[index_1] = line[index_1], line[index_0]
end
end
p line.join

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16-2.rb Normal file
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input = File.read("input-16.txt").strip.split(",")
#input = "s1,x3/4,pe/b".split(",")
matcher = /([s,p,x])(?:(\w*\/\w*)|(\w+))/
line = ('a'..'p').to_a
lines = []
#line = ('a'..'e').to_a
# Found cycles after 60 runs
actual_tries = 1000000000 % 60
(1..actual_tries).each do |i|
lines << line.dup
input.each do |s|
match_data = (s.match matcher).to_a
match_data[1] = match_data[1].to_sym
case match_data[1]
when :s
line.rotate! -(match_data[3].to_i)
when :x
positions = match_data[2].split "/"
line[positions[0].to_i], line[positions[1].to_i] = line[positions[1].to_i], line[positions[0].to_i]
when :p
buds = match_data[2].split "/"
index_0, index_1 = line.find_index(buds[0]), line.find_index(buds[1])
line[index_0], line[index_1] = line[index_1], line[index_0]
end
end
# if lines.include? line then
# p "Cycle found after: #{i.to_s}"
# break
# end
end
p line.join