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Given a palindromic string of lowercase English letters palindrome
, replace exactly one character with any lowercase English letter so that the resulting string is not a palindrome and that it is the lexicographically smallest one possible.
Return the resulting string. If there is no way to replace a character to make it not a palindrome, return an empty string.
A string a
is lexicographically smaller than a string b
(of the same length) if in the first position where a
and b
differ, a
has a character strictly smaller than the corresponding character in b
. For example, "abcc"
is lexicographically smaller than "abcd"
because the first position they differ is at the fourth character, and 'c'
is smaller than 'd'
.
Example 1:
Input: palindrome = "abccba" Output: "aaccba" Explanation: There are many ways to make "abccba" not a palindrome, such as "zbccba", "aaccba", and "abacba". Of all the ways, "aaccba" is the lexicographically smallest.
Example 2:
Input: palindrome = "a" Output: "" Explanation: There is no way to replace a single character to make "a" not a palindrome, so return an empty string.
Example 3:
Input: palindrome = "aa" Output: "ab"
Example 4:
Input: palindrome = "aba" Output: "abb"
Constraints:
1 <= palindrome.length <= 1000
palindrome
consists of only lowercase English letters.
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