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在已执行 DFS 的无向图中(为了生成 DFS 树并将每条边分类为树边或后边),图中是否存在仅由后边组成的循环,即没有树边缘?
当然。以一个大集团为例。从 clique 中删除单个 DFS 树会留下大量边,因此会留下很多循环。