摘要:
Hopscotch 时间限制: 5 Sec 内存限制: 128 MB 题目描述 You’re playing hopscotch! You start at the origin and your goal is to hop to the lattice point (N, N). A hop c 阅读全文
摘要:
Cleaning 时间限制: 2 Sec 内存限制: 256 MB 题目描述 There is a tree with N vertices, numbered 1 through N. The i th of the N−1 edges connects vertices ai and bi. C 阅读全文