{ "data": { "question": { "questionId": "2346", "questionFrontendId": "2264", "categoryTitle": "Algorithms", "boundTopicId": 1469994, "title": "Largest 3-Same-Digit Number in String", "titleSlug": "largest-3-same-digit-number-in-string", "content": "

You are given a string num representing a large integer. An integer is good if it meets the following conditions:

\n\n\n\n

Return the maximum good integer as a string or an empty string "" if no such integer exists.

\n\n

Note:

\n\n\n\n

 

\n

Example 1:

\n\n
\nInput: num = "6777133339"\nOutput: "777"\nExplanation: There are two distinct good integers: "777" and "333".\n"777" is the largest, so we return "777".\n
\n\n

Example 2:

\n\n
\nInput: num = "2300019"\nOutput: "000"\nExplanation: "000" is the only good integer.\n
\n\n

Example 3:

\n\n
\nInput: num = "42352338"\nOutput: ""\nExplanation: No substring of length 3 consists of only one unique digit. Therefore, there are no good integers.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "字符串中最大的 3 位相同数字", "translatedContent": "

给你一个字符串 num ，表示一个大整数。如果一个整数满足下述所有条件，则认为该整数是一个 优质整数 ：

\n\n\n\n

以字符串形式返回 最大的优质整数 。如果不存在满足要求的整数，则返回一个空字符串 \"\" 。

\n\n

注意：

\n\n\n\n

 

\n\n

示例 1：

\n\n
\n输入：num = \"6777133339\"\n输出：\"777\"\n解释：num 中存在两个优质整数：\"777\" 和 \"333\" 。\n\"777\" 是最大的那个，所以返回 \"777\" 。\n
\n\n

示例 2：

\n\n
\n输入：num = \"2300019\"\n输出：\"000\"\n解释：\"000\" 是唯一一个优质整数。\n
\n\n

示例 3：

\n\n
\n输入：num = \"42352338\"\n输出：\"\"\n解释：不存在长度为 3 且仅由一个唯一数字组成的整数。因此，不存在优质整数。\n
\n\n

 

\n\n

提示：

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