I first found this problem when looking at a Yodle engineering challenge question.

Basically you this takes a file with lines of numbers and finds the largest sum by totaling the largest adjacent numbers for each new line.

```
triangle_array = []

f = File.open("triangle.txt", "r")
	f.each_line do |line|
		triangle_array << line.split.map(&:to_i)
	end
f.close

lines = triangle_array.length

for i in (lines-2).downto(0).to_a do
	for j in (i).downto(0).to_a do
		triangle_array[i][j] += [triangle_array[i+1][j].to_i,triangle_array[i+1][j+1].to_i].max
	end
end

p triangle_array[0][0]

```