1281.py

'''
Given an integer number n, return the difference between the product of its digits and the sum of its digits.
 

Example 1:

Input: n = 234
Output: 15 
Explanation: 
Product of digits = 2 * 3 * 4 = 24 
Sum of digits = 2 + 3 + 4 = 9 
Result = 24 - 9 = 15
Example 2:

Input: n = 4421
Output: 21
Explanation: 
Product of digits = 4 * 4 * 2 * 1 = 32 
Sum of digits = 4 + 4 + 2 + 1 = 11 
Result = 32 - 11 = 21
'''

class Solution(object):
    def subtractProductAndSum(self, n):
        """
        :type n: int
        :rtype: int
        """
        
        from functools import reduce
        from operator import mul
        digits = [int(x) for x in str(n)]
        return reduce(mul, digits) - sum(digits)