Package g0801_0900.s0830_positions_of_large_groups

Class Solution

  • public class Solution
extends Object
    830 - Positions of Large Groups.

    Easy

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

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

    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].

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

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

    Example 1:

    Input: s = “abbxxxxzzy”

    Output: 3,6

    Explanation: "xxxx" is the only large group with start index 3 and end index 6.

    Example 2:

    Input: s = “abc”

    Output: []

    Explanation: We have groups “a”, “b”, and “c”, none of which are large groups.

    Example 3:

    Input: s = “abcdddeeeeaabbbcd”

    Output: [[3,5],[6,9],[12,14]]

    Explanation: The large groups are “ddd”, “eeee”, and “bbb”.

    Constraints:

    • 1 <= s.length <= 1000
    • s contains lowercase English letters only.

    • Constructor Detail

      • Solution

        public Solution()