Linked List in Zig-Zag fashion
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  Difficulty: Easy   Marks: 2

Given a Linked list, rearrange it such that converted list should be of the form a < b > c < d > e < f .. where a, b, c are consecutive data node of linked list and such that the order of linked list is sustained.
For example: In 11 15 20 5 10 we consider only 11 20 5 15 10 because it satisfies the above condition and the order of linked list. 5 20 11 15 10 is not considered as it does not follow the order of linked list.

Input:
You have to complete the method which takes 1 argument: the head of the  linked list. You should not read any input from stdin/console. There are multiple test cases. For each test case, this method will be called individually.

Output:
Your function should return a pointer to the zig zack linked list.

Constraints:
1 <=T<= 100
1 <= size of linked list(a) <= 1000

Example:
Input:

2
4
1 2 3 4 
5
11 15 20 5 10

Output:
1 3 2 4
11 20 5 15 10

 

Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user forExpected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.
 

** For More Input/Output Examples Use 'Expected Output' option **

Author: Shubham Joshi 1


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