solution.rb

arr = [2, 4, 5, 5, 8, 9, 11, 13]
t = 14
min_index = 0
max_index = arr.length - 1
success = false

while (min_index != max_index) && !success do
  sum = arr[min_index] + arr[max_index]

  if sum > t 
    max_index -= 1
  elsif sum < t
    min_index += 1
  else 
    success = true
  end
end