Given a binary tree, a target node in the binary tree, and an integer value k, find all the nodes that are at distance k from the given target node. No parent pointers are available.
Example 1:
Input : 20 / \ 8 22 / \ 4 12 / \ 10 14 Target Node = 8 K = 2 Output: 10 14 22 Explanation: The three nodes at distance 2 from node 8 are 10, 14, 22.
Example 2:
Input : 20 / \ 7 24 / \ 4 3 / 1 Target Node = 7 K = 2 Output: 1 24
Your Task:
You dont need to read input or print anything. Complete the function KDistanceNodes() which takes the root of the tree, target and K as input parameters and returns a list of nodes at k distance from target.
Expected Time Complexity: O(N)
Expected Auxiliary Space: O(height of tree)
Constraints:
1 ≤ N ≤ 10^3
1 ≤ data of node ≤ 10000
1 ≤ target ≤ 10000
1 ≤ k ≤ 20
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Input Format:
Custom input should have 3 lines. First line contains a string representing the tree as described below. Second line contains the data value of the target node. Third line contains the value of K.
The values in the string are in the order of level order traversal of the tree where, numbers denote node values, and a character “N” denotes NULL child.
For the above tree, the string will be: 1 2 3 N N 4 6 N 5 N N 7 N
Example :
20 8 22 4 12 N N N N 10 14 8 2
Input Format:
Custom input should have 3 lines. First line contains a string representing the tree as described below. Second line contains the data value of the target node. Third line contains the value of K.
The values in the string are in the order of level order traversal of the tree where, numbers denote node values, and a character “N” denotes NULL child.
For the above tree, the string will be: 1 2 3 N N 4 6 N 5 N N 7 N
Example :
20 8 22 4 12 N N N N 10 14 8 2
