Distinct Numbers in Window

You are given an array of N integers, A1, A2 ,…, AN and an integer K. Return the of count of distinct numbers in all windows of size K.

Formally, return an array of size N-K+1 where i’th element in this array contains number of distinct elements in sequence Ai, Ai+1 ,…, Ai+k-1.


  • If K > N, return empty array.

For example,

A=[1, 2, 1, 3, 4, 3] and K = 3

All windows of size K are

[1, 2, 1]
[2, 1, 3]
[1, 3, 4]
[3, 4, 3]

So, we return an array [2, 3, 3, 2].
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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