Find the level of each node, so you can print the tree as an indented listing.
查找每个节点的级别，这样你就能够以缩进列表形式打印这棵树了。
Notice how the program statements in Listing 3 that extend over more than one line are indented to improve readability.
注意清单3中扩展到多个行的程序语句是如何缩进以改善可读性的。
Notice how the program statements in Listing 3 that extend over more than one line are indented to improve readability.
注意清单3中扩展到多个行的程序语句是如何缩进以改善可读性的。
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