1281.go

// Source: https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer
// Title: Subtract the Product and Sum of Digits of an Integer
// Difficulty: Easy
// Author: Mu Yang <http://muyang.pro>

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 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
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package main

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