
    Write a function to validate if a parking rate code follows the dynamic pricing rule where the code number must be one less than twice its reverse value to be considered valid for that time slot. For example, if the base rate code is 234, the system should verify if 234 is one less than twice of 432.
    

    
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function to validate if a parking rate code follows the dynamic pricing rule where the code number must be one less than twice its reverse value to be considered valid for that time slot. For example, if the base rate code is 234, the system should verify if 234 is one less than twice of 432.
    

    """
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function to validate if a parking rate code follows the dynamic pricing rule where the code number must be one less than twice its reverse value to be considered valid for that time slot. For example, if the base rate code is 234, the system should verify if 234 is one less than twice of 432.
    

    """
    return 2 * rev(n) == n + 1