May I ask questions about the mysql library layout in php?

Source: Internet
Author: User
Ask php about the mysql database layout. There are two people in each of the following groups: one person in the left and right areas, and then infinitely extend. How can each member count the total number of members in the left and right zones? Share To: ask php about the mysql library layout
There are two people under each person, that is, one person in the left area and one person in the right area, and then infinitely expand down. How can each member count the total number of members in the left and right zones?

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------ Solution --------------------
This is a typical tree, binary tree, and algorithm. Recursion can be used to achieve

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