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Write a method that returns the number of nodes in a binary tree
Q:

Write a method that returns the number of nodes in a binary tree

mahmoud2506
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2022-04-28
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Write a method that returns the number of nodes in a binary tree.
TreeNode API methods: node.left() and node.right().

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mahmoud2506
2022-04-28
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public Integer getNumberOfNodes(TreeNode node) {
if (node == null) {
  return 0;
}
return 1 + getNumberOfNodes(node.left()) + getNumberOfNodes(node.right());
}

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