Number of Turns in Binary Tree
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  Difficulty: Hard   Marks: 8

Given a binary tree of size N and two nodes. Your task is to complete the function NumberOFTurn() that should return the count of the number of turns needs to reach from one node to another node of the Binary tree. if nodes are on straight-line return -1

Input:   Below Binary Tree and two nodes
        5 & 6 
                /     \
               2        3
             /   \    /   \
            4     5   6     7
           /         / \
          8         9   10
Output: Number of Turns needed to reach 
from 5 to 6:  3
Input: For above tree if two nodes are 1 & 4
Output: Straight line : -1 turn, 

The function takes three arguments as input, the reference pointer to the root of the binary tree, second argument is the key value of the first node and third argument is the key value of the second node.
There are T test cases and for each test case the function will be called separately.

For each test case the function should return the number of turns required for going from first node to second node in the given binary tree.



1 2 L 1 3 R
2 3
1 2 L 1 3 R 2 4 L 2 5 R  3 6 L 3 7 R 4 8 L 6 9 L 6 10 R
5 10

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.

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

Contributor: Harshit Sidhwa
Author: harshitsidhwa

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