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80. Print All The Nodes Which are X distance from the Root
Objective:  Given Binary Tree, Print all the nodes which are X distance from the root
Example :
Appraoch:
 The idea is very simple.
 Do the preorder traversal, pass x as a parameter.
 While going down, at each level, keep reducing the x by 1
 When x = 0, the means you have reached the nodes which are at x distance from the root, Print them.
Code:
Output:
Output: Nodes at 3 distance from root : 6 7 9