Can someone help me understand for which cases my code fails to give correct output
https://www.codechef.com/viewsolution/43283815
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 
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”.