Package g0801_0900.s0830_positions_of_large_groups

Class Solution

java.lang.Object
g0801_0900.s0830_positions_of_large_groups.Solution
public class Solution extends java.lang.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 Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.util.List<java.util.List<java.lang.Integer>>
    largeGroupPositions(java.lang.String s)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • largeGroupPositions

      public java.util.List<java.util.List<java.lang.Integer>> largeGroupPositions(java.lang.String s)