1. There might be duplicates present in the array.
2. The order of the permutations in the output does not matter.
3. Do not use any kind of in-built library functions to find the answer.
The first line contains the integer N, denoting the size of the array.
The second line contains N space-separated integers denoting the array elements.
The output contains K lines, where each line contains N space-separated integers denoting one of the unique permutations of the given array.
Output for each test case must be in a separate line.
You do not need to print anything, it has already been taken care of. Just implement the given function.
1 <= N <= 6
Time Limit: 1 sec
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