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The height of a binary tree with no children is 0.
If you are returning -1 in this case, that only works if you also have somewhere that adds +1 so the final return value becomes 0.
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Tree: Height of a Binary Tree
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The height of a binary tree with no children is 0. If you are returning -1 in this case, that only works if you also have somewhere that adds +1 so the final return value becomes 0.