An integer N (1 ≤ N ≤ 100), representing some quantity or size.
An integer K (1 ≤ K ≤ 10^5), representing another quantity or size.
A list of N integers, each integer is unique and between 1 and K (inclusive).

### Example Input:

```
2
5
2 3
```

### 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
    '''