First element to occur k times
Basic Accuracy: 48.44% Submissions: 4137 Points: 1

Given an array of N integers. Find the first element that occurs K number of times. 

Example 1:

Input :
N = 7, K = 2
A[] = {1, 7, 4, 3, 4, 8, 7}
Output :
Both 7 and 4 occur 2 times. 
But 4 is first that occurs 2 times.


Your Task:  
You don't need to read input or print anything. Your task is to complete the function firstElementKTime() which takes the array A[], its size N and an integer K as inputs and returns the required answer. If answer is not present in the array, return -1.


Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)


1 <= N, K <= 105
1<= A <= 106





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First element to occur k times

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