You are given two strings s and target, each of length n, consisting of lowercase English letters.
Return the lexicographically smallest string that is both a palindromic permutation of s and strictly greater than target. If no such permutation exists, return an empty string.
\n
Example 1:
\n\nInput: s = "baba", target = "abba"
\n\nOutput: "baab"
\n\nExplanation:
\n\ns (in lexicographical order) are "abba" and "baab".target is "baab".Example 2:
\n\nInput: s = "baba", target = "bbaa"
\n\nOutput: ""
\n\nExplanation:
\n\ns (in lexicographical order) are "abba" and "baab".target. Therefore, the answer is "".Example 3:
\n\nInput: s = "abc", target = "abb"
\n\nOutput: ""
\n\nExplanation:
\n\ns has no palindromic permutations. Therefore, the answer is "".
Example 4:
\n\nInput: s = "aac", target = "abb"
\n\nOutput: "aca"
\n\nExplanation:
\n\ns is "aca"."aca" is strictly greater than target. Therefore, the answer is "aca".\n
Constraints:
\n\n1 <= n == s.length == target.length <= 300s and target consist of only lowercase English letters.给你两个长度均为 n 的字符串 s 和目标字符串 target，它们都由小写英文字母组成。
返回 字典序最小的字符串 ，该字符串 既 是 s 的一个 回文排列 ，又是字典序 严格 大于 target 的。如果不存在这样的排列，则返回一个空字符串。
如果字符串 a 和字符串 b 长度相同，在它们首次出现不同的位置上，字符串 a 处的字母在字母表中的顺序晚于字符串 b 处的对应字母，则字符串 a 在 字典序上严格大于 字符串 b。
排列 是指对字符串中所有字符的重新排列。
\n\n如果一个字符串从前向后读和从后向前读都一样，则该字符串是 回文 的。
\n\n\n\n
示例 1:
\n\n输入: s = \"baba\", target = \"abba\"
\n\n输出: \"baab\"
\n\n解释:
\n\ns 的回文排列（按字典序）是 \"abba\" 和 \"baab\"。target 的排列是 \"baab\"。示例 2:
\n\n输入: s = \"baba\", target = \"bbaa\"
\n\n输出: \"\"
\n\n解释:
\n\ns 的回文排列（按字典序）是 \"abba\" 和 \"baab\"。target。因此，答案是 \"\"。示例 3:
\n\n输入: s = \"abc\", target = \"abb\"
\n\n输出: \"\"
\n\n解释:
\n\ns 没有回文排列。因此，答案是 \"\"。
示例 4:
\n\n输入: s = \"aac\", target = \"abb\"
\n\nOutput: \"aca\"
\n\n解释:
\n\ns 唯一的回文排列是 \"aca\"。\"aca\" 在字典序上严格大于 target。因此，答案是 \"aca\"。\n\n
提示:
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"style": "LEETCODE",
"exampleTestcases": "\"baba\"\n\"abba\"\n\"baba\"\n\"bbaa\"\n\"abc\"\n\"abb\"\n\"aac\"\n\"abb\"",
"__typename": "QuestionNode"
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