A string is beautiful if:
\n\nk letters of the English lowercase alphabet.2 or more which is a palindrome.You are given a beautiful string s of length n and a positive integer k.
Return the lexicographically smallest string of length n, which is larger than s and is beautiful. If there is no such string, return an empty string.
A string a is lexicographically larger than a string b (of the same length) if in the first position where a and b differ, a has a character strictly larger than the corresponding character in b.
"abcd" is lexicographically larger than "abcc" because the first position they differ is at the fourth character, and d is greater than c.\n
Example 1:
\n\n\nInput: s = "abcz", k = 26\nOutput: "abda"\nExplanation: The string "abda" is beautiful and lexicographically larger than the string "abcz".\nIt can be proven that there is no string that is lexicographically larger than the string "abcz", beautiful, and lexicographically smaller than the string "abda".\n\n\n
Example 2:
\n\n\nInput: s = "dc", k = 4\nOutput: ""\nExplanation: It can be proven that there is no string that is lexicographically larger than the string "dc" and is beautiful.\n\n\n
\n
Constraints:
\n\n1 <= n == s.length <= 1054 <= k <= 26s is a beautiful string.如果一个字符串满足以下条件，则称其为 美丽字符串 ：
\n\nk 个字母组成。2 或更长的回文子字符串。给你一个长度为 n 的美丽字符串 s 和一个正整数 k 。
请你找出并返回一个长度为 n 的美丽字符串，该字符串还满足：在字典序大于 s 的所有美丽字符串中字典序最小。如果不存在这样的字符串，则返回一个空字符串。
对于长度相同的两个字符串 a 和 b ，如果字符串 a 在与字符串 b 不同的第一个位置上的字符字典序更大，则字符串 a 的字典序大于字符串 b 。
\"abcd\" 的字典序比 \"abcc\" 更大，因为在不同的第一个位置（第四个字符）上 d 的字典序大于 c 。\n\n
示例 1：
\n\n\n输入：s = \"abcz\", k = 26\n输出：\"abda\"\n解释：字符串 \"abda\" 既是美丽字符串，又满足字典序大于 \"abcz\" 。\n可以证明不存在字符串同时满足字典序大于 \"abcz\"、美丽字符串、字典序小于 \"abda\" 这三个条件。\n\n\n
示例 2：
\n\n\n输入：s = \"dc\", k = 4\n输出：\"\"\n解释：可以证明，不存在既是美丽字符串，又字典序大于 \"dc\" 的字符串。\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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