How would you print out the data in a binary tree, level by level, starting at the top?
你将怎样以水平打印二叉树数据，水平，在顶开始？
It maintains the free space in heap as nodes in a Cartesian binary search tree format.
它按照Cartesian二分法检索树格式以节点的形式维护堆中的空闲空间。
In the above example, a simple hashmap or binary search tree could have easily solved the problem, but implementing one of these data structures in XSL would be inconvenient and unnecessary.
在上面的示例中，如果使用一个简单的散列图(hashmap)或二进制搜索树就可以轻易地解决问题，但是用XSL实现一个这样的数据结构并不是很方便，并且是不必要的。
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