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80. Find Nodes at Distance X from Root in a Tree
Objective:  Given Binary Tree, Print all the nodes which are X distance from the root
Example :
Approach:
 Do the preorder traversal, and pass x as a parameter.
 While going down, at each level, keep reducing the x by 1
 When x = 0, this means you have reached the nodes that are at x distance from the root, Print them.
Output:
Output: Nodes at 3 distance from root : 6 7 9