You are given a string s. Reorder the string using the following algorithm:
s and append it to the result.s that is greater than the last appended character, and append it to the result.s and append it to the result.s that is smaller than the last appended character, and append it to the result.s have been removed.If the smallest or largest character appears more than once, you may choose any occurrence to append to the result.
\n\nReturn the resulting string after reordering s using this algorithm.
\n
Example 1:
\n\n\nInput: s = "aaaabbbbcccc"\nOutput: "abccbaabccba"\nExplanation: After steps 1, 2 and 3 of the first iteration, result = "abc"\nAfter steps 4, 5 and 6 of the first iteration, result = "abccba"\nFirst iteration is done. Now s = "aabbcc" and we go back to step 1\nAfter steps 1, 2 and 3 of the second iteration, result = "abccbaabc"\nAfter steps 4, 5 and 6 of the second iteration, result = "abccbaabccba"\n\n\n
Example 2:
\n\n\nInput: s = "rat"\nOutput: "art"\nExplanation: The word "rat" becomes "art" after re-ordering it with the mentioned algorithm.\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 500s consists of only lowercase English letters.给你一个字符串 s ，请你根据下面的算法重新构造字符串：
s 中选出 最小 的字符，将它 接在 结果字符串的后面。s 剩余字符中选出比上一个添加字符更大的 最小 字符，将它 接在 结果字符串后面。s 中选择字符。s 中选出 最大 的字符，将它 接在 结果字符串的后面。s 剩余字符中选出比上一个添加字符更小的 最大 字符，将它 接在 结果字符串后面。s 中选择字符。s 中所有字符都已经被选过。在任何一步中，如果最小或者最大字符不止一个 ，你可以选择其中任意一个，并将其添加到结果字符串。
\n\n请你返回将 s 中字符重新排序后的 结果字符串 。
\n\n
示例 1：
\n\n\n输入：s = \"aaaabbbbcccc\"\n输出：\"abccbaabccba\"\n解释：第一轮的步骤 1，2，3 后，结果字符串为 result = \"abc\"\n第一轮的步骤 4，5，6 后，结果字符串为 result = \"abccba\"\n第一轮结束，现在 s = \"aabbcc\" ，我们再次回到步骤 1\n第二轮的步骤 1，2，3 后，结果字符串为 result = \"abccbaabc\"\n第二轮的步骤 4，5，6 后，结果字符串为 result = \"abccbaabccba\"\n\n\n
示例 2：
\n\n\n输入：s = \"rat\"\n输出：\"art\"\n解释：单词 \"rat\" 在上述算法重排序以后变成 \"art\"\n\n\n
\n\n
提示：
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"exampleTestcases": "\"aaaabbbbcccc\"\n\"rat\"",
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