Pi

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Hopefully, you know how to find the value of $\pi$ for a circle. That's the first part of geometry basics, after all! But this problem is different. In a galaxy far, far away, $\pi$ is defined as the ratio of the circumference $C$ and the diameter $D$ of a binary tree. The circumference $C$ is defined as the total number of leaf nodes (nodes having no children/sub-nodes) in the binary tree, and

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solution.cppC++17

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