// where 'n' is the length of 'nums'. // For each number in 'nums', we traverse each position for the permutations to add the number, // with each permutation being O(n!). // Space Complexity : O(n!), ...

Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. If a palindromic permutation exists, we just ...