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也就是说，优先级队列中应该只包含一条到达某个第二类顶点的边。
That is, the queue should contain only one edge to each category 2 vertex.
youdao
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顶点角的两边相交的点。
The point at which the sides of an Angle intersect.
youdao
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边是一个在两个顶点之间的线。
Edge is a line between two vertices.
youdao
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边是一个在两个顶点之间的线。
Edge is a line between two vertices.
youdao