Wave Array Interviewbit Solution

Problem: Wave Array

Problem Description:

Given an array of integers, sort the array into a wave like array and return it,
 In other words, arrange the elements into a sequence such that

a1 >= a2 <= a3 >= a4 <= a5.....

Example

Given [1, 2, 3, 4]
 One possible answer : [2, 1, 4, 3]
 Another possible answer : [4, 1, 3, 2]

NOTE : If there are multiple answers possible, return the one that's lexicographically smallest. So, in the example case, you will return [2, 1, 4, 3]

Solution: