Kth smallest element.cpp

/*
Kth smallest element 
====================

Given an array arr[] and a number 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:
Input:
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:
Input:
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, it's size and an integer k as input and returns the kth smallest element.


Expected Time Complexity: O(n)
Expected Auxiliary Space: O(1)

Constraints:
1 <= N <= 105
1 <= arr[i] <= 105
1 <= K <= N
*/

// arr : given array
// l : starting index of the array i.e 0
// r : ending index of the array i.e size-1
// k : find kth smallest element and return using this function

int kthSmallest(int arr[], int l, int r, int k)
{
  sort(arr + l, arr + r + 1);
  return arr[k - 1];
}