Kth smallest element
Medium Accuracy: 46.66% Submissions: 100k+ Points: 4

Given an array arr[] and an integer K where K is smaller than size of array, the task is to find the Kth smallest element in the given array. It is given that all array elements are distinct.

Example 1:

N = 6
arr[] = 7 10 4 3 20 15
K = 3
Output : 7
Explanation :
3rd smallest element in the given 
array is 7.

Example 2:

N = 5
arr[] = 7 10 4 20 15
K = 4
Output : 15
Explanation :
4th smallest element in the given 
array is 15.
Your Task:
You don't have to read input or print anything. Your task is to complete the function kthSmallest() which takes the array arr[], integers l and r denoting the starting and ending index of the array and an integer K as input and returns the Kth smallest element.
Expected Time Complexity: O(n)
Expected Auxiliary Space: O(1)

1 <= N <= 105
1 <= arr[i] <= 105
1 <= K <= N


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Kth smallest element

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