'''
https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer/
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
'''

def subtractProductAndSum(n):
    s = str(n)
    l = list(s)
    product = 1
    summary = 0
    for n in l:
        num = int(n)
        product *= num
        summary += num

    return product - summary

assert subtractProductAndSum(234) ==15
assert subtractProductAndSum(4421) ==21

