Objective: – Given a binary tree, print it in vertical order path.
What is Vertical Order
as you can see in the example above, [4],[2], [1,5,6],[3],[7] are the verical order of the given binary tree.
Approach:
- Its a tricky solution.
- Do the preordertraversal.
- Take a variable called level, when ever you go left, do level++ AND when ever you go right do level–.
- With step above we have separated out the levels vertically.
- Now you need to store the elements of each level, so create a TreeMap and the (key,value) pair will be (level,elements at that level).
- At the end iterate through the TreeMap and print the results.
Separate out the vertical levels
Complete Code:
Output:
[4] [2] [1, 5, 6] [3] [7]