Find Union and Intersection of two sorted arrays. Modify it the same for two unsorted arrays

Union and Intersection of two sorted arrays

Given two sorted arrays, find their union and intersection.

For example, if the input arrays are: 
arr1[] = {1, 3, 4, 5, 7}
arr2[] = {2, 3, 5, 6}
Then your program should print Union as {1, 2, 3, 4, 5, 6, 7} and Intersection as {3, 5}. 

http://www.geeksforgeeks.org/union-and-intersection-of-two-sorted-arrays-2/

Find Union and Intersection of two unsorted arrays

Given two unsorted arrays that represent two sets (elements in every array are distinct), find union and intersection of two arrays.

For example, if the input arrays are:
arr1[] = {7, 1, 5, 2, 3, 6}
arr2[] = {3, 8, 6, 20, 7}
Then your program should print Union as {1, 2, 3, 5, 6, 7, 8, 20} and Intersection as {3, 6}. Note that the elements of union and intersection can be printed in any order.

http://www.geeksforgeeks.org/find-union-and-intersection-of-two-unsorted-arrays/