There are n cats in a line, labeled from 1 to n, with the i-th cat at position i. They are bored of gyrating in the same spot all day, so they want to reorder themselves such that no cat is in the same place as before. They are also lazy, so they want to minimize the total distance they move. Help them decide what cat should be at each location after the reordering. For example, if there are 3 cats, this is a valid reordering: 3, 1, 2]. No cat is in its original position. The total distance the cats move is 1+1+2= 4 as cat 1 moves one place to the right, cat 2 moves one place to the right, and cat 3 moves two places to the left.

There are n cats in a line, labeled from 1 to n, with the i-th cat at position i. They are bored of gyrating in the same spot all day, so they want to reorder themselves such that no cat is in the same place as before. They are also lazy, so they want to minimize the total distance they move. Help them decide what cat should be at each location after the reordering. For example, if there are 3 cats, this is a valid reordering: 3, 1, 2]. No cat is in its original position. The total distance the cats move is 1+1+2= 4 as cat 1 moves one place to the right, cat 2 moves one place to the right, and cat 3 moves two places to the left.

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

Please fast in c++

There are n cats in a line, labeled from 1 to n, with the i-th cat at position i. They are bored of gyrating in the same spot all day, so they
want to reorder themselves such that no cat is in the same place as before. They are also lazy, so they want to minimize the total distance
they move. Help them decide what cat should be at each location after the reordering.
For example, if there are 3 cats, this is a valid reordering: [3, 1, 2]. No cat is in its original position. The total distance the cats move is
1+1+2= 4 as cat 1 moves one place to the right, cat 2 moves one place to the right, and cat 3 moves two places to the left.
Input
The first line contains a single integer t (1 <t< 100) – the number of test cases. Then t test cases follow.
The first and only line of each test case contains one integer n (2 < n < 100) – the number of cats.
It can be proven that under the constraints of the problem, an answer always exist.
Output
Output t answers, one for each test case. Each answer consists of n integers –a permutation with the minimum total distance. If there are
multiple answers, print any.
Example
input
Copy
2
2
3
output
Copy
2 1
3 1 2
Note
For the first test case, there is only one possible permutation that satisfies the conditions: [2, 1]
The second test case was described in the statement. Another possible answer is 2, 3, 1].

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