Joeferyの博客

DescriptionThere 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 two village A and B are connected, i

1982. Electrification PlanTime limit: 0.5 secondMemory limit: 64 MBSome country has n cities. The government has decided to electrify all these cities. At first, power stations in k diff