Can someone help me understand for which cases my code fails to give correct output

Just think about cone > ceven. is it always true that we cannot from a valid string?

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Is it not that if i’m not able to place my single count characters in a palindromic even string ,we are unable to create such a string …We cant use odd palindromic string …oh wait …while typing this …i realized we can use the odd length palindromic string as well…thanks man :slight_smile:

You can utilize the odd length palindromes just like you were doing for even length palindromes. Eg- If the count is 7, then 2 characters with frequency 1 can be accommodated like “xxyxxzxxx”.