Codeforces Round 803 (Div. 2) |
---|

Finished |

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

constructive algorithms

graphs

implementation

math

*2800

No tag edit access

The problem statement has recently been changed. View the changes.

×
F. Equal Reversal

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThere is an array $$$a$$$ of length $$$n$$$. You may perform the following operation on it:

- Choose two indices $$$l$$$ and $$$r$$$ where $$$1 \le l \le r \le n$$$ and $$$a_l = a_r$$$. Then, reverse the subsegment from the $$$l$$$-th to the $$$r$$$-th element, i. e. set $$$[a_l, a_{l + 1}, \ldots, a_{r - 1}, a_r]$$$ to $$$[a_r, a_{r-1}, \ldots, a_{l+1}, a_l]$$$.

You are also given another array $$$b$$$ of length $$$n$$$ which is a permutation of $$$a$$$. Find a sequence of at most $$$n^2$$$ operations that transforms array $$$a$$$ into $$$b$$$, or report that no such sequence exists.

Input

Each test contains multiple test cases. The first line contains a single integer $$$t$$$ ($$$1 \leq t \leq 100$$$) — the number of test cases. The description of the test cases follows.

The first line of each test case contains an integer $$$n$$$ ($$$1 \le n \le 500$$$) — the length of array $$$a$$$ and $$$b$$$.

The second line of each test case contains $$$n$$$ integers $$$a_1, a_2, \ldots, a_n$$$ ($$$1 \le a_i \le n$$$) — elements of the array $$$a$$$.

The third line of each test case contains $$$n$$$ integers $$$b_1, b_2, \ldots, b_n$$$ ($$$1 \le b_i \le n$$$) — elements of the array $$$b$$$.

It is guaranteed that $$$b$$$ is a permutation of $$$a$$$.

It is guaranteed that the sum of $$$n$$$ over all test cases does not exceed $$$500$$$.

Output

For each test case, output "NO" (without quotes) if it is impossible to turn $$$a$$$ into $$$b$$$ using at most $$$n^2$$$ operations.

Otherwise, output "YES" (without quotes). Then output an integer $$$k$$$ ($$$0 \leq k \leq n^2$$$) denoting the number of operations you will perform. Note that you don't have to minimize the number of operations.

Afterwards, output $$$k$$$ lines. The $$$i$$$-th line should contain two integers $$$l_i$$$ and $$$r_i$$$ ($$$1 \leq l_i \leq r_i \leq n$$$) — the left and right indices for the $$$i$$$-th operation.

You can output "YES" and "NO" in any case (for example, strings "yEs", "yes" and "Yes" will be recognized as a positive response).

If there are multiple possible sequences of operations, you may output any of them.

Example

Input

581 2 4 3 1 2 1 11 1 3 4 2 1 2 171 2 3 1 3 2 31 3 2 3 1 2 331 1 21 2 121 22 1111

Output

YES 2 5 8 1 6 YES 2 1 4 3 6 NO NO YES 0

Note

In the first test case, we can perform the following operations: $$$$$$[1,2,4,3,1,2,1,1] \xrightarrow[l=5,\,r=8]{} [1,2,4,3,1,1,2,1] \xrightarrow[l=1,\,r=6]{} [1,1,3,4,2,1,2,1].$$$$$$

In the second test case, we can perform the following operations: $$$$$$[1,2,3,1,3,2,3] \xrightarrow[l=1,\,r=4]{} [1,3,2,1,3,2,3] \xrightarrow[l=3,\,r=6]{} [1,3,2,3,1,2,3].$$$$$$

It can be proven that it is impossible to turn $$$a$$$ into $$$b$$$ in the third and fourth test cases.

Codeforces (c) Copyright 2010-2023 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Dec/11/2023 05:00:38 (k1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|