Piccollage question#2

goodPoint.rb

def goodPoint(arr)
	arrSize = arr.size
	tempArr = Array.new(arrSize-1)
	tempArr.each_index do |ind|
		tempArr[ind] = arr[ind+1] - arr[ind]
	end
	maxNumber = 0
	tempMaxNumber = 0
	flag = 0 
	(0..arrSize-2).each do |i|
		if tempArr[i]+tempMaxNumber > maxNumber
			tempMaxNumber += tempArr[i]
			maxNumber = tempMaxNumber
			#if flag == 0
				flag = i
			#end
		elsif tempArr[i]+tempMaxNumber > 0
			tempMaxNumber += tempArr[i]
		else
			tempMaxNumber = 0
			#flag = 0 
		end
	end
	puts "Buy the stock at $#{( arr[flag+1] - maxNumber )}\nand then sell it at $#{arr[flag+1]}\nfor a profit of $#{maxNumber}"
end