Tree bttom view

#1


why code is not working for two test cases

#2

you are supposed to print the bottom view of the tree, not the preorder traversal of tree.
for eg.
if the tree is: 1 2 3 4 5 -1 -1.
the preorder is: 1 2 4 5 3
bottom view: 4 2 5 3 (what you see when you look from bottom)

you are expected to print the later one.

thanks