Due to another of his misbehaved, the primary school's teacher of the young Gauß, Herr J.G. Büttner, to keep the bored and unruly young schoolboy Karl Friedrich Gauss busy for a good long time, while he teaching arithmetic to his mates, assigned him the problem of adding up all the whole numbers from 1 through a given number n.
Your task is to help the young Carl Friedrich to solve this problem as quickly as you can; so, he can astonish his teacher and rescue his recreation interval.
Here's, an example:
f(n=100) // returns 5050
It's your duty to verify that n is a valid positive integer number. If not, please, return false (None for Python, null for C#, 0 for COBOL).
Solution:
def validate_int(func):
def wrapper(n):
if not isinstance(n, int):
return
if n < 1:
return
return func(n)
return wrapper
@validate_int
def f(n: int) -> int:
return sum(range(1, n+1))
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