Package g0301_0400.s0352_data_stream_as_disjoint_intervals

Class SummaryRanges

java.lang.Object
g0301_0400.s0352_data_stream_as_disjoint_intervals.SummaryRanges
public class SummaryRanges extends java.lang.Object
352 - Data Stream as Disjoint Intervals.

Hard

Given a data stream input of non-negative integers a1, a2, …, an, summarize the numbers seen so far as a list of disjoint intervals.

Implement the SummaryRanges class:

  • SummaryRanges() Initializes the object with an empty stream.
  • void addNum(int val) Adds the integer val to the stream.
  • int[][] getIntervals() Returns a summary of the integers in the stream currently as a list of disjoint intervals [starti, endi].

Example 1:

Input

 ["SummaryRanges", "addNum", "getIntervals", "addNum", "getIntervals", "addNum", "getIntervals", "addNum", "getIntervals", "addNum", "getIntervals"]
 [ [], [1], [], [3], [], [7], [], [2], [], [6], []]

Output: [null, null, 1, 1, null, [[1, 1], [3, 3]], null, [[1, 1], [3, 3], [7, 7]], null, [[1, 3], [7, 7]], null, [[1, 3], [6, 7]]]

Explanation:

 SummaryRanges summaryRanges = new SummaryRanges();
 summaryRanges.addNum(1); // arr = [1]
 summaryRanges.getIntervals(); // return [[1, 1]]
 summaryRanges.addNum(3); // arr = [1, 3]
 summaryRanges.getIntervals(); // return [[1, 1], [3, 3]]
 summaryRanges.addNum(7); // arr = [1, 3, 7]
 summaryRanges.getIntervals(); // return [[1, 1], [3, 3], [7, 7]]
 summaryRanges.addNum(2); // arr = [1, 2, 3, 7]
 summaryRanges.getIntervals(); // return [[1, 3], [7, 7]]
 summaryRanges.addNum(6); // arr = [1, 2, 3, 6, 7]
 summaryRanges.getIntervals(); // return [[1, 3], [6, 7]]

Constraints:

  • 0 <= val <= 104
  • At most 3 * 104 calls will be made to addNum and getIntervals.

Follow up: What if there are lots of merges and the number of disjoint intervals is small compared to the size of the data stream?

  • Constructor Summary

    Constructors
    Constructor
    Description
    SummaryRanges()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    addNum(int val)
     
    int[][]
    getIntervals()
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • SummaryRanges

      public SummaryRanges()

  • Method Details

    • addNum

      public void addNum(int val)

    • getIntervals

      public int[][] getIntervals()