A15940 | Sort the Subarray

Monocarp had an array $a$ consisting of $n$ integers. He has decided to choose two integers $l$ and $r$ such that $1 \le l \le r \le n$ , and then sort the subarray $a[l..r]$ (the subarray $a[l..r]$ is the part of the array $a$ containing the elements $a_l, a_{l+1}, a_{l+2}, \dots, a_{r-1}, a_r$ ) in non-descending order. After sorting the subarray, Monocarp has obtained a new array, which we denote as $a'$ .

For example, if $a = [6, 7, 3, 4, 4, 6, 5]$ , and Monocarp has chosen $l = 2, r = 5$ , then $a' = [6, 3, 4, 4, 7, 6, 5]$ .

You are given the arrays $a$ and $a'$ . Find the integers $l$ and $r$ that Monocarp could have chosen. If there are multiple pairs of values $(l, r)$ , find the one which corresponds to the longest subarray.

The first line contains one integer $t$ ( $1 \le t \le 10^4$ ) — the number of test cases.

Each test case consists of three lines:

- the first line contains one integer $n$ ( $2 \le n \le 2 \cdot 10^5$ );
- the second line contains $n$ integers $a_1, a_2, \dots, a_n$ ( $1 \le a_i \le n$ );
- the third line contains $n$ integers $a'_1, a'_2, \dots, a'_n$ ( $1 \le a'_i \le n$ ).

Additional constraints on the input:

- the sum of $n$ over all test cases does not exceed $2 \cdot 10^5$ ;
- it is possible to obtain the array $a'$ by sorting one subarray of $a$ ;
- $a' \ne a$ (there exists at least one position in which these two arrays are different).

For each test case, print two integers — the values of $l$ and $r$ ( $1 \le l \le r \le n$ ). If there are multiple answers, print the values that correspond to the longest subarray. If there are still multiple answers, print any of them.