Package g0301_0400.s0352_data_stream_as_disjoint_intervals

Class SummaryRanges

  • public class SummaryRanges
extends 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 Detail

      • SummaryRanges

        public SummaryRanges()

    • Method Detail

      • addNum

        public void addNum​(int val)

      • getIntervals

        public int[][] getIntervals()