checking if 2 numbers of array add up to I

Question

I saw a interview question as follows: Give an unsorted array of integers A and and an integer I, find out if any two members of A add up to I.

any clues?

ti

Answer 1

for each ele in the array
  if (sum - ele) is hashed and hashed value is not equal to index of ele
    print ele, sum-ele
  end-if
  Hash ele as key and index as value
end-for