Amazing Trick

3000ms

1048576K

Description:

Alice is a magician and she creates a new trick. She has $$$n$$$ cards with different numbers from $$$1$$$ to $$$n$$$ written on them. First, she asks an audience member to shuffle the deck and put cards in a row. Let's say the $$$i$$$-th card from the left has the number $$$a_i$$$ on it.

Then Alice picks two permutations $$$p$$$ and $$$q$$$. There is a restriction on $$$p$$$ and $$$q$$$ — permutations can't have fixed points. Which means $$$\forall i: p_i \ne i\ and\ q_i \ne i$$$.

After permutations are chosen, Alice shuffles the cards according to them. Now the $$$i$$$-th card from the left is the card $$$a[p[q[i]]$$$. The trick is considered successful if $$$i$$$-th card from the left has the number $$$i$$$ on it after the shuffles.

Help Alice pick the permutations $$$p$$$ and $$$q$$$ or say it is not possible for the specific starting permutation $$$a$$$.

Input:

The first line of the input contains the number of tests $$$t$$$ ($$$1 \leq t \leq 10^5$$$).

Each test is described in two lines. The first line contains one integer $$$n$$$ — the number of cards ($$$1 \leq n \leq 10^5$$$). The second line contains $$$n$$$ integers $$$a_i$$$ — the initial permutation of the cards ($$$1 \leq a_i \leq n$$$; $$$\forall i \neq j: a_i \neq a_j$$$).

It is guaranteed that the sum of $$$n$$$ over all tests does not exceed $$$10^5$$$.

Output:

Print the answer for each test case in the same order the cases appear in the input.

For each test case, print "Impossible" in a single line, if no solution exists.

Otherwise, print "Possible" in the first line, and in the following two lines print permutations $$$p$$$ and $$$q$$$.

Sample Input:

Sample Output:

Impossible
Possible
3 1 2
2 3 1
Possible
3 4 2 1
3 4 2 1
Possible
4 1 2 5 3
3 1 4 5 2

Informação

Provedor Codeforces

Código CF1773A