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

Problem Summary #

Given an integer n, help calculate and return the difference between the “product of its digits” and the “sum of its digits”.

Note:

• 1 <= n <= 10^5

Solution Ideas #

• Given a number, calculate the difference between the product of each digit and the sum of each digit.
• Easy problem; just handle the input and output according to the problem statement.

Code #

func subtractProductAndSum(n int) int {
	sum, product := 0, 1
	for ; n > 0; n /= 10 {
		sum += n % 10
		product *= n % 10
	}
	return product - sum
}