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D. Shichikuji and Power Gridtime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputShichikuji is the new resident deity of the South Bl...

Hello everyone! I am your old friend Rikka. Welcome to Xuzhou. This is the first problem, which is a problem about the minimum spanning tree (MST). I promise you all that this should be the \textbf{ea...

Given a connected undirected graph, tell if its minimum spanning tree is unique.Definition 1 (Spanning Tree): Consider a connected, undirected graph G = (V, E). A spanning tree of G is a subgraph of...