这篇博客详细介绍了LeetCode中的222题，即如何在O(log n)的时间复杂度内计算一个完全二叉树的节点数。通过给出的问题描述、示例及解决方案，读者可以理解如何解决此类问题，适用于准备面试和提升算法能力的程序员。
Question:
Given the root of a complete binary tree, return the number of the nodes in the tree.
According to Wikipedia, every level, except possibly the last, is completely filled in a complete binary tree, and all nodes in the last level are as far left as possible. It can have between 1 and 2h nodes inclusive at the last level h.
Design an algorithm that runs in less than O(n) time complexity.
Example 1:
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