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Given a Binary Tree, you need to find the maximum value which you can get by subtracting the value of node B from the value of node A, where A and B are two nodes of the binary tree and A is an ancestor of B.

**Example 1:**

**Input:
** 5
/ \
2 1
**Output: **4**
Explanation:**The maximum difference we can
get is 4, which is bewteen 5 and 1.

**Example 2:**

**Input:
** 1
/ \
2 3
\
7
**Output: **-1**
Explanation:**The maximum difference we can
get is -1, which is between 1 and 2.

**Your Task:**

The task is to complete the function **maxDiff**() which finds the maximum difference between the node and its ancestor.

**Expected Time Complexity:** O(N).

**Expected Auxiliary Space:** O(H).

Note: H is the height of the tree.

**Constraints:**

1 <= Number of edges <= 10^{4}

0 <= Data of a node <= 10^{5}

**Note: **The **Input/Output** format and **Examples** given are used for the 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 the stdin/console. The task is to complete the function specified, and not to write the full code.

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Maximum difference between node and its ancestor

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