{ "data": { "question": { "questionId": "1770", "questionFrontendId": "1647", "categoryTitle": "Algorithms", "boundTopicId": 473570, "title": "Minimum Deletions to Make Character Frequencies Unique", "titleSlug": "minimum-deletions-to-make-character-frequencies-unique", "content": "

A string s is called good if there are no two different characters in s that have the same frequency.

\n\n

Given a string s, return the minimum number of characters you need to delete to make s good.

\n\n

The frequency of a character in a string is the number of times it appears in the string. For example, in the string "aab", the frequency of 'a' is 2, while the frequency of 'b' is 1.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "aab"\nOutput: 0\nExplanation: s is already good.\n
\n\n

Example 2:

\n\n
\nInput: s = "aaabbbcc"\nOutput: 2\nExplanation: You can delete two 'b's resulting in the good string "aaabcc".\nAnother way it to delete one 'b' and one 'c' resulting in the good string "aaabbc".
\n\n

Example 3:

\n\n
\nInput: s = "ceabaacb"\nOutput: 2\nExplanation: You can delete both 'c's resulting in the good string "eabaab".\nNote that we only care about characters that are still in the string at the end (i.e. frequency of 0 is ignored).\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字符频次唯一的最小删除次数", "translatedContent": "

如果字符串 s 中 不存在 两个不同字符 频次 相同的情况，就称 s 是 优质字符串 。

\n\n

给你一个字符串 s，返回使 s 成为 优质字符串 需要删除的 最小 字符数。

\n\n

字符串中字符的 频次 是该字符在字符串中的出现次数。例如，在字符串 \"aab\" 中，'a' 的频次是 2，而 'b' 的频次是 1 。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：s = \"aab\"\n输出：0\n解释：s 已经是优质字符串。\n
\n\n

示例 2：

\n\n
\n输入：s = \"aaabbbcc\"\n输出：2\n解释：可以删除两个 'b' , 得到优质字符串 \"aaabcc\" 。\n另一种方式是删除一个 'b' 和一个 'c' ，得到优质字符串 \"aaabbc\" 。
\n\n

示例 3：

\n\n
\n输入：s = \"ceabaacb\"\n输出：2\n解释：可以删除两个 'c' 得到优质字符串 \"eabaab\" 。\n注意，只需要关注结果字符串中仍然存在的字符。（即，频次为 0 的字符会忽略不计。）\n
\n\n

 

\n\n

提示：

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