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 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
List<List<Integer>>	largeGroupPositions(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 List<List<Integer>> largeGroupPositions(String s)