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;
}
}