Given a string . Find a string , where B is a palindrome and A is a subsequence of B.
A subsequence of a string is a string that can be derived from it by deleting some (not necessarily consecutive) characters without changing the order of the remaining characters. For example, “cotst” is a subsequence of “contest”.
A palindrome is a string that reads the same forward or backward.
Input : A = "aba" Output : B = aba Explanation : "aba" is a subsequence of "aba" which is a palindrome. Input : A = "ab" Output : B = abba
Approach: Let reverse(s) be the reverse of a string . Now, s + reverse(s) will always have as a subsequence (as first half) and it is a palindrome.
Therefore, B = A + reverse(A).
Below is the implementation of the above approach:
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- Rearrange the string to maximize the number of palindromic substrings
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