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