apple_stock.rb

stock = [1,8,3,0,1,54,29,1,3,10,49,10,39,28,41,1,3]
prices= Array.new
stock.each_with_index  do |buy_price, buy_index|
  stock.each_with_index do |sell_price, sell_index|
    if buy_index < sell_index
      value = sell_price - buy_price
      hr = {sell_index: sell_index, buy_index: buy_index, value: value}
      prices << hr
   end
  end
end
max = prices.max_by{|k,v| k[:value] }
puts "Best time to buy was index #{max[:buy_index]} and the best time to sell was index #{max[:sell_index]} total profit was #{max[:value]}"