As the minimum feedback vertex set problem is NP-complete, it is hard to be solved exactly.
最小反馈节点集问题是一个NP完全问题，很难准确求解。
A subset of the vertex set of a graph is a feedback vertex set of the graph if the resulting graph is acyclic after removing the vertex subset from the graph.
若从一个图中去掉某些顶点后得到的导出子图是无圈图，则所去的那些顶点组成的集合就是原图的反馈点集。
A subset of the vertex set of a graph is a feedback vertex set of the graph if the resulting graph is a forest after removing the vertex subset from the graph.
如果从一个图中去掉某些顶点后得到的导出子图是无圈图，则所去的那些顶点组成的集合就是原图的反馈点集。
A subset of the vertex set of a graph is a feedback vertex set of the graph if the resulting graph is a forest after removing the vertex subset from the graph.
如果从一个图中去掉某些顶点后得到的导出子图是无圈图，则所去的那些顶点组成的集合就是原图的反馈点集。
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