You are given a string caption of length n. A good caption is a string where every character appears in groups of at least 3 consecutive occurrences.
For example:
\n\n"aaabbb" and "aaaaccc" are good captions."aabbb" and "ccccd" are not good captions.You can perform the following operation any number of times:
\n\nChoose an index i (where 0 <= i < n) and change the character at that index to either:
caption[i] != 'a').caption[i] != 'z').Your task is to convert the given caption into a good caption using the minimum number of operations, and return it. If there are multiple possible good captions, return the lexicographically smallest one among them. If it is impossible to create a good caption, return an empty string "".
a is lexicographically smaller than a string b if in the first position where a and b differ, string a has a letter that appears earlier in the alphabet than the corresponding letter in b. If the first min(a.length, b.length) characters do not differ, then the shorter string is the lexicographically smaller one.\n\n
Example 1:
\n\nInput: caption = "cdcd"
\n\nOutput: "cccc"
\n\nExplanation:
\n\nIt can be shown that the given caption cannot be transformed into a good caption with fewer than 2 operations. The possible good captions that can be created using exactly 2 operations are:
\n\n"dddd": Change caption[0] and caption[2] to their next character 'd'."cccc": Change caption[1] and caption[3] to their previous character 'c'.Since "cccc" is lexicographically smaller than "dddd", return "cccc".
Example 2:
\n\nInput: caption = "aca"
\n\nOutput: "aaa"
\n\nExplanation:
\n\nIt can be proven that the given caption requires at least 2 operations to be transformed into a good caption. The only good caption that can be obtained with exactly 2 operations is as follows:
\n\ncaption[1] to 'b'. caption = "aba".caption[1] to 'a'. caption = "aaa".Thus, return "aaa".
Example 3:
\n\nInput: caption = "bc"
\n\nOutput: ""
\n\nExplanation:
\n\nIt can be shown that the given caption cannot be converted to a good caption by using any number of operations.
\n\n
Constraints:
\n\n1 <= caption.length <= 5 * 104caption consists only of lowercase English letters.给你一个长度为 n 的字符串 caption 。如果字符串中 每一个 字符都位于连续出现 至少 3 次 的组中，那么我们称这个字符串是 好 标题。
比方说：
\n\n\"aaabbb\" 和 \"aaaaccc\" 都是 好 标题。\"aabbb\" 和 \"ccccd\" 都 不是 好标题。你可以对字符串执行以下操作 任意 次：
\n\n选择一个下标 i（其中 0 <= i < n ）然后将该下标处的字符变为：
caption[i] != 'a' ）caption[i] != 'z' ）你的任务是用 最少 操作次数将 caption 变为 好 标题。如果存在 多种 好标题，请返回它们中 字典序最小 的一个。如果 无法 得到好标题，请你返回一个空字符串 \"\" 。
a 和 b 中，如果两个字符串第一个不同的字符处，字符串 a 的字母比 b 的字母在字母表里出现的顺序更早，那么我们称字符串 a 的 字典序 比 b 小 。如果两个字符串前 min(a.length, b.length) 个字符都相同，那么较短的一个字符串字典序比另一个字符串小。\n\n\n\n
示例 1：
\n\n输入：caption = \"cdcd\"
\n\n输出：\"cccc\"
\n\n解释：
\n\n无法用少于 2 个操作将字符串变为好标题。2 次操作得到好标题的方案包括：
\n\n\"dddd\" ：将 caption[0] 和 caption[2] 变为它们后一个字符 'd' 。\"cccc\" ：将 caption[1] 和 caption[3] 变为它们前一个字符 'c' 。由于 \"cccc\" 字典序比 \"dddd\" 小，所以返回 \"cccc\" 。
示例 2：
\n\n输入：caption = \"aca\"
\n\n输出：\"aaa\"
\n\n解释：
\n\n无法用少于 2 个操作将字符串变为好标题。2 次操作得到好标题的方案包括：
\n\ncaption[1] 变为 'b' ，caption = \"aba\" 。caption[1] 变为 'a' ，caption = \"aaa\" 。所以返回 \"aaa\" 。
示例 3：
\n\n输入：caption = \"bc\"
\n\n输出：\"\"
\n\n解释：
\n\n由于字符串的长度小于 3 ，无法将字符串变为好标题。
\n\n\n
提示：
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