摘要:
题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <= 2000). Each field i is descr 阅读全文
摘要:
Description 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 oth 阅读全文