每次选择队首顶点向其折叠点合并，并且更新队列中受影响的顶点信息，再对队列重新排序。
The top vertex in the queue was to be folded first and updated the vertices which were affected, then the queue was sorted again.
每次选择队首顶点向其折叠点合并，并且更新队列中受影响的顶点信息，再对队列重新排序。
The top vertex in the queue was to be folded first and updated the vertices which were affected, then the queue was sorted again.
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