CF1793C Dora and Search

As you know, the girl Dora is always looking for something. This time she was given a permutation, and she wants to find such a subsegment of it that none of the elements at its ends is either the minimum or the maximum of the entire subsegment. More formally, you are asked to find the numbers $ l $ and $ r $ $ (1 \leq l \leq r \leq n) $ such that $ a_l \neq \min(a_l, a_{l + 1}, \ldots, a_r) $ , $ a_l \neq \max(a_l, a_{l + 1}, \ldots, a_r) $ and $ a_r \neq \min(a_l, a_{l + 1}, \ldots, a_r) $ , $ a_r \neq \max(a_l, a_{l + 1}, \ldots, a_r) $ . A permutation of length $ n $ is an array consisting of $ n $ distinct integers from $ 1 $ to $ n $ in any order. For example, $ [2,3,1,5,4] $ is a permutation, but $ [1,2,2] $ is not a permutation ( $ 2 $ occurs twice in the array) and $ [1,3,4] $ is also not a permutation ( $ n=3 $ , but $ 4 $ is present in the array). Help Dora find such a subsegment, or tell her that such a subsegment does not exist.

N/A

N/A

In the first and fourth test cases, it can be shown that there are no desired subsegments. In the second test case, the subsegment $ [1, 4] $ satisfies all the conditions, because $ \max(a_1, a_2, a_3, a_4) = 4, \min(a_1, a_2, a_3, a_4) = 1 $ , as we see, all the conditions are met. In the third test case, the subsegment $ [2, 6] $ also satisfies all the conditions described.