【CF简介】 题目链接:CF 86D 题面: D. Powerful array time limit per test 5 seconds memory limit per test 256 megabytes input standard input output standard output An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarrayal, al + 1..., ar, where1 ≤ l ≤ r ≤ n