Directed (Optimum Branchings), Super Dense MST (Minimum Spanning Tree (MST))
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Description
A minimum spanning tree (MST) or minimum weight spanning tree is a subset of the edges of a connected; edge-weighted undirected graph that connects all the vertices together; without any cycles and with the minimum possible total edge weight. Here, we're given a directed graph with a root and $E=\Omega(V^2)$ edges, and we wish to find a spanning arborescence of minimum weight that is rooted at the root.
Related Problems
Generalizations: Directed (Optimum Branchings), General MST
Related: Undirected, General MST, Undirected, Dense MST, Undirected, Planar MST, Undirected, Integer Weights MST
Parameters
V: number of vertices
E: number of edges
U: maximum edge weight
Table of Algorithms
| Name | Year | Time | Space | Approximation Factor | Model | Reference |
|---|---|---|---|---|---|---|
| Tarjan (directed, dense) | 1987 | $O(V^{2})$ | $O(E)$ | Exact | Deterministic | Time & Space |