Shulou(Shulou.com)06/03 Report--

Background

Calculate the tree-level structural data, the ultimate node. Use recursive calculation to get a 3-level submenu

problem

Unable to get child node

Analysis.

It is correct to monitor recursion. The required submenu has been identified

Solve

The variable is declared outside the method, and the result is assigned to the peripheral variable, which can be used normally.

Reason

You cannot take the result out of recursion with return

Summary

Recursive, please reject the reurn value.

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