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K distance from root (Function Problem)

Given a Binary Tree and a number k. Print all nodes that are at distance k from root (root is considered at distance 0 from itself).  Nodes should be printed from left to right.  If k is more that height of tree, nothing should be printed.

For example, if below is given tree and k is 2.  Output should be 4 5 6.

1
/     \
2        3
/         /   \
4        5    6
\
8

Input:
The task is to complete the method which takes two arguments, root of Binary Tree and k. The struct Node has a data part which stores the data, pointer to left child and pointer to right child.
There are multiple test cases. For each test case, this method will be called individually.

Output:
The function should print nodes at k distance from root. Nodes should be printed from left to right.

Constraints:
1 <=T<= 30
1 <= Number of nodes<= 100
1 <= Data of a node<= 1000

Example:
Input:

2
2 0
1 2 R 1 3 L
4 2
10 20 L 10 30 R 20 40 L 20 60 R

Output:
1
40 60

There are two test casess.  First case represents a tree with 3 nodes, 2 edges and value of k as 0. Here root is 1, left child of 1 is 3 and right child of 1 is 2.   Second test case represents a tree with 4 edges and 5 nodes and k as 1.

Note:The Input/Ouput format and Example given above are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console, and should not print anything on stdout/console. The task is to complete the function specified, and not to write the full code.

** For More Input/Output Examples Use 'Expected Output' option **

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Compilation/Execution Result: