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#!/usr/bin/env ruby
def directions_for_values(values)
directions = []
values.each_with_index do |value, index|
next if index.zero?
distance = (value.to_i - values[index-1].to_i)
direction = if (distance.abs > 3 )
:err
elsif distance > 0
:up
elsif distance < 0
:down
else
:err
end
directions << direction
end
return 0 if directions.count(:err) > 1
directions.uniq.count == 1 ? 1 : 0
end
data = File.read("data.txt")
data = data.split("\n")
data = data.map(&:split)
safe_arr = data.map do |row|
results = [directions_for_values(row)]
row.each_with_index do |value, index|
tmp_arr = row.dup
tmp_arr.delete_at(index)
results << directions_for_values(tmp_arr)
end
results
end.map(&:sum)
p safe_arr.count { |row| row > 0 }
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