1281. Subtract the Product and Sum of Digits of an Integer

Problem

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

Solution (Java)

class Solution {
    public int subtractProductAndSum(int n) {
        int product = 1;
        int sum = 0;
        while (n != 0) {
            int digit = n % 10;
            product = product * digit;
            sum = sum + digit;
            n /= 10;
        }
        return product - sum;
    }
}

Explain:

nope.

Complexity:

• Time complexity : O(n).
• Space complexity : O(n).