{ "data": { "question": { "questionId": "857", "questionFrontendId": "830", "categoryTitle": "Algorithms", "boundTopicId": 1064, "title": "Positions of Large Groups", "titleSlug": "positions-of-large-groups", "content": "

In a string s of lowercase letters, these letters form consecutive groups of the same character.

\n\n

For example, a string like s = "abbxxxxzyy" has the groups "a", "bb", "xxxx", "z", and "yy".

\n\n

A group is identified by an interval [start, end], where start and end denote the start and end indices (inclusive) of the group. In the above example, "xxxx" has the interval [3,6].

\n\n

A group is considered large if it has 3 or more characters.

\n\n

Return the intervals of every large group sorted in increasing order by start index.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "abbxxxxzzy"\nOutput: [[3,6]]\nExplanation: "xxxx" is the only large group with start index 3 and end index 6.\n
\n\n

Example 2:

\n\n
\nInput: s = "abc"\nOutput: []\nExplanation: We have groups "a", "b", and "c", none of which are large groups.\n
\n\n

Example 3:

\n\n
\nInput: s = "abcdddeeeeaabbbcd"\nOutput: [[3,5],[6,9],[12,14]]\nExplanation: The large groups are "ddd", "eeee", and "bbb".\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "较大分组的位置", "translatedContent": "

在一个由小写字母构成的字符串 s 中，包含由一些连续的相同字符所构成的分组。

\n\n

例如，在字符串 s = \"abbxxxxzyy\" 中，就含有 \"a\", \"bb\", \"xxxx\", \"z\" 和 \"yy\" 这样的一些分组。

\n\n

分组可以用区间 [start, end] 表示，其中 start 和 end 分别表示该分组的起始和终止位置的下标。上例中的 \"xxxx\" 分组用区间表示为 [3,6] 。

\n\n

我们称所有包含大于或等于三个连续字符的分组为 较大分组 。

\n\n

找到每一个 较大分组 的区间，按起始位置下标递增顺序排序后，返回结果。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：s = \"abbxxxxzzy\"\n输出：[[3,6]]\n解释：\"xxxx\" 是一个起始于 3 且终止于 6 的较大分组。\n
\n\n

示例 2：

\n\n
\n输入：s = \"abc\"\n输出：[]\n解释：\"a\",\"b\" 和 \"c\" 均不是符合要求的较大分组。\n
\n\n

示例 3：

\n\n
\n输入：s = \"abcdddeeeeaabbbcd\"\n输出：[[3,5],[6,9],[12,14]]\n解释：较大分组为 \"ddd\", \"eeee\" 和 \"bbb\"
\n\n

示例 4：

\n\n
\n输入：s = \"aba\"\n输出：[]\n
\n \n\n

提示：

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