Năm nhuận hay không

def is_leap_opt(year: int) -> bool:
    # A year is a leap year if it is divisible by 4 but not by 100, 
    # except when it is also divisible by 400.
    return (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0)

def is_leap_brute(year: int) -> bool:
    if year % 400 == 0:
        return True
    if year % 100 == 0:
        return False
    if year % 4 == 0:
        return True
    return False