Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their. Example : Given string S : aab The output. The palindrome does not need to be limited to just dictionary words. In simple terms, the problem states that: Make the string a palindrome by rearranging it in any way by removing the minimum number of characters including removing 0 number of character if possible. We'll initialize the dictionary counts to an empty dictionary. I have this short function ispermutationpalindrome, which returns true only if the input string may be rearranged to form a palindrome: include create a data structure to store the counts of each letter. If the string contains one odd occurring element, all palindromic permutations will be of odd length with the middle element as the odd occurring character. So, if we count the number of appearances for each letter, the count has to be even for all letters, and at most one odd count. In longer palindromes such as "Do geese see God?", you might notice some letters can show more than twice ('e' appears four times), but at most one letter can appear an odd number of times. What properties do all palindromes have in common? Looking at some examples like tacocat, racecar, and kayak, you might notice that each letter appears twice, except for the middle letter. Return an empty list if no palindromic permutation could be form. Enter fullscreen mode Exit fullscreen mode Given a string s, return all the palindromic permutations (without duplicates) of it.
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