Question: Treat this problem like other tree search problems. You are looking for a node where either the right or left child is null, and the
Treat this problem like other tree search problems. You are looking for a node where either the right or left child is null, and the other child is not null. If you find that node, you can stop and immediately return true. Otherwise keep looking. If you walk off the tree, you have not found a node with a single child!
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