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advent-of-code/2017/ruby/day_06.rb

28 lines
452 B

banks = ARGF.read.strip.split("\t").map(&:to_i)
history = { banks => true}
count = 0
seen = false
loop do
v, i = banks.map.with_index {|v,i| [v,i] }.max_by(&:first)
banks[i] = 0
i += 1
while v > 0
banks[i % banks.size] += 1
v -= 1
i += 1
end
count += 1
if history.has_key?(banks)
if seen
puts count
exit
else
history.clear
seen = true
count = 0
end
end
history[banks] = true
end