Minimum Spanning Trees
Bottleneck minimum spanning tree. Given a connected edge-weighted graph, design an efficient algorithm to find a minimum bottleneck spanning tree. The bottleneck capacity of a spanning tree is the weights of its largest edge. A minimum bottleneck spanning tree is a spanning tree of minimum bottleneck capacity.
Hint: prove that an MST is a minimum bottleneck spanning tree.
Extra challenge: Compute a minimum bottleneck spanning tree in linear time in the worst case. Assume that you can compute the median of n keys in linear time in the worst case.
反证法证明最小生成树一定是瓶颈生成树:假如最小生成树不是瓶颈生成树,记最小生成树 T T T的最大权边为e,则存在一棵瓶颈树 T b T_b Tb, T b T_b Tb中的所有边的权值都小于e的权值。删除 T T

这篇博客探讨了最小生成树(MST)的概念,包括如何证明MST是瓶颈生成树,以及如何在线性时间内寻找最小瓶颈生成树。此外,还讨论了如何在给定边的情况下判断它是否属于MST,以及寻找最小权重反馈边集的问题,提示可以通过最小生成树的补集来解决。
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