An integer \(N\) (2 ≤ \(N\) ≤ 200000), representing some quantity or size.  
An integer \(K\) (1 ≤ \(K\) ≤ \(N-1\)), representing another quantity or size.  
A list of integers \(A\) of size \(N\), where each integer \(A[i]\) (1 ≤ \(A[i]\) ≤ \(10^9\)).

### Example Input:

```
5
3
96 98 95 100 20
```

### Function Signature:
Write a function f(N, K, A) that takes in the input. 
def f(N: int, K: int, A: List[int]): 
    ''' 
    N: an integer 
    K: an integer 
    A: a list of integers 
    '''