摘要:
Given a connected undirected graph, tell if its minimum spanning tree is unique. Definition 1 (Spanning Tree): Consider a connected, undirected graph 阅读全文
摘要:
There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say t 阅读全文
摘要:
You are a member of the space station engineering team, and are assigned a task in the construction process of the station. You are expected to write 阅读全文