Given a Binary tree and a number N, write a program to find the N-th node in the Preorder traversal of the given Binary tree.
Prerequisite: Tree Traversal
Input: N = 4 11 / \ 21 31 / \ 41 51 Output: 51 Explanation: Preorder Traversal of given Binary Tree is 11 21 41 51 31, so 4th node will be 51. Input: N = 5 25 / \ 20 30 / \ / \ 18 22 24 32 Output: 30
The idea to solve this problem is to do preorder traversal of the given binary tree and keep track of the count of nodes visited while traversing the tree and print the current node when the count becomes equal to N.
Time Complexity: O(n), where n is the number of nodes in the given binary tree.
Auxiliary Space: O(1)
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