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Top k numbers in a stream
Medium Accuracy: 43.67% Submissions: 300 Points: 4

Given N numbers in an array. Your task is to keep at-most K numbers at the top (According to their frequency).  We basically need to print top k numbers when input stream has included k distinct elements, else need to print all distinct elements sorted by frequency.

Example 1:

Input:
N=5, K=4
arr[] = {5, 2, 1, 3, 2}
Output: 5 2 5 1 2 5 1 2 3 5 2 1 3 5
Explanation:
Firstly their was 5 whose frequency
is max till now. so print 5.
Then 2 , which is smaller than 5 but
their frequency is same so print 2 5.
Then 1, which is smallet among all the
number arrived, so print 1 2 5.
Then 3 , so print 1 2 3 5
Then again 2, which has the highest
frequency among all number so 2 1 3 5.

Example 2:

Input:
N=5, K=4
arr[] = {5, 2, 1, 3, 4}
Output: 5 2 5 1 2 5 1 2 3 5 1 2 3 4
Explanation:
Firstly their was 5 whose frequency is
max till now. so print 5.
Then 2 , which is smaller than 5 but
their frequency is same so print 2 5.
Then 1, Which is smallest among all the
number arrived, so print 1 2 5.
Then 3 , so print 1 2 3 5.
Then 4, so 1 2 3 4 as K is 4 so print
at-most k elements.


Since, this is a function problem. You don't need to take any input, as it is already accomplished by the driver code. You just need to complete the function kTop() that takes array ainteger n and integer k as parameters and returns the array that contains our desired output.

Expected Time Complexity: O(N*K).
Expected Auxiliary Space: O(N).

Constraints:
1 ≤ N,K ≤ 103