Question From HackerRandk: John works at a clothing store. He has a large pile of socks that he must pair by color for sale. Given an array of integers representing the color of each sock, determine how many pairs of socks with matching colors there are.
Function Description It must return an integer representing the number of matching pairs of socks that are available.
sockMerchant has the following parameter(s): n: the number of socks in the pile v: the colors of each sock
Sample Input 9 10 20 20 10 10 30 50 10 20
Sample Output 3