Contains Duplicate

You have been given an array “ARR” of integers and an integer ‘K’. Your task is to find a pair of distinct indices ‘i’ and ‘j’ such that ARR[i] == ARR[j] and | i - j | <= ‘K’.

Input Format :
The first line contains a single integer ‘T’ representing the number of test cases. The 'T' test cases follow.

The first line of each test case will contain two integers ‘N’ and ‘K’ where ‘N’ is the number of elements in the array, and the integer ‘K’ is described as above.

The second line of each test case will contain ‘N’ space-separated integers denoting the elements in the array.
Output Format :
For each test case, print “Yes” (without quotes) if a pair of such distinct indices (described in the problem statement) exists otherwise print “No” (without quotes).

Output for every test case will be printed in a separate line.
Note :
You do not need to print anything, it has already been taken care of. Just implement the given function.
Constraints :
1 <= T <= 50
1 <= N <= 10000
1 <= K <= 10000
0 <= ARR[i] <= 10^9

Where 'ARR[i]' denotes the ith element of the given array.

Time limit: 1 sec
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HSBC Group Software Developer Interview Questions
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