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Merge two BST 's
##### Submissions: 15829   Accuracy: 50%   Difficulty: Medium   Marks: 4

Given two BST, Return elements of both BSTs in sorted form.

Example 1:

```Input:
BST1:
5
/   \
3     6
/ \
2   4
BST2:
2
/   \
1     3
\
7
/
6
BST2 = 2 1 3 N N N 7 6
Output: 1 2 2 3 3 4 5 6 6 7
Explanation: After merging and sorting the
two BST we get 1 2 2 3 3 4 5 6 6 7
```

Example 2:

```Input:
BST1:
12
/
9
/
6
\
11
BST2:
8
/  \
5    10
/
2
Output: 2 5 6 8 9 10 11 12
Explanation: After merging and sorting the
two BST we get 2 5 6 8 9 10 11 12```

You don't need to read input or print anything. Your task is to complete the function merge() which takes roots of both the BSTs as its input and returns an array of integers denoting the node values of both the BSTs in a sorted order.

Expected Time Complexity: O(M+N) where M and N are the sizes if the two BSTs.
Expected Auxiliary Space: O(Height of BST1 + Height of BST2).

Constraints:
1 <= Number of Nodes <= 100000

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

Contributor: Harshit Sidhwa
Author: Shubham Joshi 1

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