find pair of numbers in array that add to given sum

Question

Question: Given an unsorted array of positive integers, is it possible to find a pair of integers from that array that sum up to a given sum?

Constraints: This shou

Answer 1

Ruby implementation

ar1 = [ 32, 44, 68, 54, 65, 43, 68, 46, 68, 56]
for i in 0..ar1.length-1
 t  = 100 - ar1[i]
  if ar1.include?(t)
    s= ar1.count(t)
    if s < 2
      print   s , " - " ,  t, " , " , ar1[i]  , " pair ", i, "\n"
    end
  end
end