03-樹2 List Leaves（C/C++)

Given a tree, you are supposed to list all the leaves in the order of top down, and left to right. 給定一棵樹，您應該按照自頂向下和從左到右的順序列出所有的葉子。 Input Specification: 輸入規格： Each input file contains one test case. Fo

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