也可能有由其他系统提供的预先构建的部分树。
Alternatively, you might be in a position to have pre-constructed parts of the tree, which are provided by other systems.
延迟构建仅仅意味着只有在访问的时候才构造要访问的这部分树。
Deferred building simply means that no part of the tree is built unless it is accessed.
本文给出了求最小部分树的一种新方法,同时给出最短路权的矩阵求法。
This paper gives a new method of finding the minimal sub-tree and gives the method of finding the matrix of minimal path weight.
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