Grokking the Coding Interview: Patterns for Coding Questions
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Kth Largest Number in a Stream (medium)

Problem Statement

Design a class to efficiently find the Kth largest element in a stream of numbers.

The class should have the following two things:

  1. The constructor of the class should accept an integer array containing initial numbers from the stream and an integer ‘K’.
  2. The class should expose a function add(int num) which will store the given number and return the Kth largest number.

Example 1:

Input: [3, 1, 5, 12, 2, 11], K = 4
1. Calling add(6) should return '5'.
2. Calling add(13) should return '6'.
2. Calling add(4) should still return '6'.





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