Tree Bottom View

#1

I cant understand the input and output
Please explain

#2

hi
its a level order input like
root node
then its left and right child
then 4 inputs each 2 child of above
and -1 in case it does not have any child

for bottom view u just imagine which node is seen when u see from below
some nodes overlap each other so u only have to [print that node that can be shown from below