Complete the function to print spiral order traversal of a tree. For below tree, function should print 1, 2, 3, 4, 5, 6, 7.
Input Format:
First line of input contains the number of test cases T. For each test case, there will be only a single line of input which is a string representing the tree as described below:
The values in the string are in the order of level order traversal of the tree where, numbers denotes node values, and a character “N” denotes NULL child.
For example:
For the above tree, the string will be: 1 2 3 N N 4 6 N 5 N N 7 N
Output Format:
The function should print level order traversal in spiral form.
Your Task:
The task is to complete the function printSpiral() which prints the elements in spiral form of level order traversal. The newline is automatically appended by the driver code.
Constraints:
1 <= T <= 30
1 <= Number of nodes <= 10^{5}
1 <= Data of a node <= 10^{5}
Example:
Input:
2
1 3 2
10 20 30 40 60
Output:
1 3 2
10 20 30 60 40
Explanation:
Testcase1: The tree is
1
/ \
3 2
So, the spiral level order would be 1 3 2
Testcase2: The tree is
10
/ \
20 30
/ \
40 60
So, the spiral level order would be 10 20 30 60 40
Note: The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected 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.
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