Algo. Mult – Sum

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

Decision

public class Solution {
    public int SubtractProductAndSum(int n) {
            string s = n.ToString();
            var mult = 1;
            var sum = 0;

            foreach (var el in s) {
                var digit = Int32.Parse(el.ToString());
                
                mult *= digit;
                sum += digit;
            }
        
        return mult - sum;
        
    }
}
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