A. Circle Line

  • 考虑环上的最短距离。

B. New Problem

  • \(n\) 个串建后缀自动机。
  • 找的时候bfs一下即可。

C. Learning Languages

  • 并查集维护可以沟通的人。
  • 注意会0种语言的人必然要学习。

D. Set of Points

  • 构造类似于\(y = \frac{1}{x}\) 的两条曲线即可。

E. Game

  • 本质其实就是个Nim博弈。
  • 若先手胜，要找出第一步的可行解，即判断\[sg\ xor\ a_i \le a_i\]

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