题目内容

The topological sequence of any directed acyclic graph is unique.

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The critical path is the shortest path from the source point to the end point.

There is no node of degree 1 in huffman tree.

In a binary sort tree, new nodes are inserted as always leaf nodes.

Can you tell me how to ____________an invitation without hurting people’s feeling?

A. accept
B. say yes
C. decline
D. say no

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