摘要：
题目链接： D. Pashmak and Parmida's problem Parmida is a clever girl and she wants to participate in Olympiads this year. Of course she wants her partner t 阅读全文
摘要：
题目链接： D. Powerful array An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarray al, al + 1..., ar, where 1 ≤ l 阅读全文