Problem of the Day
A new programming or logic puzzle every Mon-Fri

A classic, but challenging programming problem for us to solve today. The goal is to create a function or method that takes in a binary tree and inverts it. It is safe to assume the tree has at least one node. For example:

           1
           / \ 
          2 3 
              \
              4 

               4 
              /
           2 3
            \ /
             1

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