The helper method recursively checks if the two nodes are both null, which means they are symmetric, or if they have the same value and their subtrees are also symmetric. It does this by calling itself with the left child of the left node and the right child of the right node, and ...
If I could talk to my twelve-year-old self, what would I say? Fight the boys back with insults? Laugh at them and tell them I loved my face? Push them off their bikes? The wisest way would have been to heed my mother: ‘Silly boys showing off…you are beautiful inside and out’...