Bottom view should be 4 2 5 6 3 i guess...but ans shows 4 2 6 3 ? why so

#1 
       1
      /      \
   2           3
/     \       /

4 5 6

#2

hello @hg11110000

       1
     /      \
  2           3
/     \       /
4      5 6

here node 5 and 6 are overlapping so in that case we need to consider right most node (among overlapping node) in our case it is 6.
that is why we have 4 2 6 3 in our output.

#3

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