1281-subtract-the-product-and-sum-of-digits-of-an-integer.py

"""
Problem Link: 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
 
Constraints:
1 <= n <= 10^5
"""
class Solution:
    def subtractProductAndSum(self, n: int) -> int:
        sum, product = 0, 1
        while n:
          digit = n % 10
          sum += digit
          product *= digit
          n //= 10
        return product - sum