You are given a string s consisting of lowercase English letters.
The frequency group for a value k is the set of characters that appear exactly k times in s.
The majority frequency group is the frequency group that contains the largest number of distinct characters.
\n\nReturn a string containing all characters in the majority frequency group, in any order. If two or more frequency groups tie for that largest size, pick the group whose frequency k is larger.
\n
Example 1:
\n\nInput: s = "aaabbbccdddde"
\n\nOutput: "ab"
\n\nExplanation:
\n\n| Frequency (k) | \n\t\t\tDistinct characters in group | \n\t\t\tGroup size | \n\t\t\tMajority? | \n\t\t
|---|---|---|---|
| 4 | \n\t\t\t{d} | \n\t\t\t1 | \n\t\t\tNo | \n\t\t
| 3 | \n\t\t\t{a, b} | \n\t\t\t2 | \n\t\t\tYes | \n\t\t
| 2 | \n\t\t\t{c} | \n\t\t\t1 | \n\t\t\tNo | \n\t\t
| 1 | \n\t\t\t{e} | \n\t\t\t1 | \n\t\t\tNo | \n\t\t
Both characters 'a' and 'b' share the same frequency 3, they are in the majority frequency group. "ba" is also a valid answer.
Example 2:
\n\nInput: s = "abcd"
\n\nOutput: "abcd"
\n\nExplanation:
\n\n| Frequency (k) | \n\t\t\tDistinct characters in group | \n\t\t\tGroup size | \n\t\t\tMajority? | \n\t\t
|---|---|---|---|
| 1 | \n\t\t\t{a, b, c, d} | \n\t\t\t4 | \n\t\t\tYes | \n\t\t
All characters share the same frequency 1, they are all in the majority frequency group.
\nExample 3:
\n\nInput: s = "pfpfgi"
\n\nOutput: "fp"
\n\nExplanation:
\n\n| Frequency (k) | \n\t\t\tDistinct characters in group | \n\t\t\tGroup size | \n\t\t\tMajority? | \n\t\t
|---|---|---|---|
| 2 | \n\t\t\t{p, f} | \n\t\t\t2 | \n\t\t\tYes | \n\t\t
| 1 | \n\t\t\t{g, i} | \n\t\t\t2 | \n\t\t\tNo (tied size, lower frequency) | \n\t\t
Both characters 'p' and 'f' share the same frequency 2, they are in the majority frequency group. There is a tie in group size with frequency 1, but we pick the higher frequency: 2.
\n
Constraints:
\n\n1 <= s.length <= 100s consists only of lowercase English letters.给你一个由小写英文字母组成的字符串 s。
对于一个值 k，频率组 是在 s 中恰好出现 k 次的字符集合。
众数频率组 是包含 不同 字符数量最多的频率组。
\n\n返回一个字符串，包含众数频率组中的所有字符，字符的顺序 不限 。如果两个或多个频率组的大小并列最大，则选择其频率 k 较大 的那个组。
\n\n
示例 1:
\n\n输入: s = \"aaabbbccdddde\"
\n\n输出: \"ab\"
\n\n解释:
\n\n| 频率 (k) | \n\t\t\t组中不同字符 | \n\t\t\t组大小 | \n\t\t\t是否众数? | \n\t\t
|---|---|---|---|
| 4 | \n\t\t\t{d} | \n\t\t\t1 | \n\t\t\t否 | \n\t\t
| 3 | \n\t\t\t{a, b} | \n\t\t\t2 | \n\t\t\t是 | \n\t\t
| 2 | \n\t\t\t{c} | \n\t\t\t1 | \n\t\t\t否 | \n\t\t
| 1 | \n\t\t\t{e} | \n\t\t\t1 | \n\t\t\t否 | \n\t\t
字符 'a' 和 'b' 的频率相同，都为 3，它们在众数频率组中。
示例 2:
\n\n输入: s = \"abcd\"
\n\n输出: \"abcd\"
\n\n解释:
\n\n| 频率 (k) | \n\t\t\t组中不同字符 | \n\t\t\t组大小 | \n\t\t\t是否众数? | \n\t\t
|---|---|---|---|
| 1 | \n\t\t\t{a, b, c, d} | \n\t\t\t4 | \n\t\t\t是 | \n\t\t
所有字符的频率都相同，都为 1，它们都在众数频率组中。
\n示例 3:
\n\n输入: s = \"pfpfgi\"
\n\n输出: \"fp\"
\n\n解释:
\n\n| 频率 (k) | \n\t\t\t组中不同字符 | \n\t\t\t组大小 | \n\t\t\t是否众数? | \n\t\t
|---|---|---|---|
| 2 | \n\t\t\t{p, f} | \n\t\t\t2 | \n\t\t\t是 | \n\t\t
| 1 | \n\t\t\t{g, i} | \n\t\t\t2 | \n\t\t\t否 (组大小并列，选择频率更大的 k = 2) | \n\t\t
字符 'p' 和 'f' 的频率相同，都为 2，它们在众数频率组中。频率为 1 的组大小并列，但我们选择频率更高的组 2。
\n\n
提示:
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