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Insert a node in a BST
Easy Accuracy: 32.7% Submissions: 79148 Points: 2

Given a BST and a key K. If K is not present in the BST, Insert a new Node with a value equal to K into the BST.
Note: If K is already present in the BST, don't modify the BST.

Example 1:

Input:
2
/   \
1     3
K = 4
Output: 1 2 3 4
Explanation: After inserting the node 4
Inorder traversal will be 1 2 3 4.


Example 2:

Input:
2
/   \
1     3
\
6
K = 4
Output: 1 2 3 4 6
Explanation: After inserting the node 4
Inorder traversal of the above tree
will be 1 2 3 4 6.

You don't need to read input or print anything. Your task is to complete the function insert() which takes the root of the BST and Key K as input parameters and returns the root of the modified BST after inserting K.
Note: The generated output contains the inorder traversal of the modified tree.

Expected Time Complexity: O(Height of the BST).
Expected Auxiliary Space: O(Height of the BST).

Constraints:
1 <= Number of nodes <= 105

1 <= K <= 106