如果一个图是不连通的或有割点，就发生这种情况。
This happens if the graph is disconnected or has a cut vertex.
我们将看到树可以定义为一个不包含回路的连通图。
We shall see that a tree can be defined as a connected graph which contains no circuits.
对不连通的图输出其各个连通支(C)。
Is not connected to the output of its various connectivity graph branch (c).
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