Given an unsorted array of nonnegative integers, find a continuous sub-array which adds to a given number. Examples :
Input: arr[] = {1, 4, 20, 3, 10, 5}, sum = 33 Ouptut: Sum found between indexes 2 and 4 Sum of elements between indices 2 and 4 is 20 + 3 + 10 = 33
Difficulty Level-Medium