You are given a binary tree and a node in the tree, your task is to find all the nodes in the binary tree which are at a distance K from that node. These nodes can be downwards [descendants of the node] or upwards.

For example: In this image

http://www.cs.mcgill.ca/~jeromew/comp252/images/Binary_tree.png

The nodes that are at a distance 2 from 7 are 5 (6’s left child), 11, 5 (2’s right child).

This is a coding question.

Function prototype:

void PrintKDistanceNode(Node *root, Node *node, int K)

{

}