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

​​https://leetcode.com/problems/subtract-the-product-and-sum-of-digits-of-an-integer/​​

题目描述

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​​

C++ 实现 1

class Solution {
public:
    int subtractProductAndSum(int n) {
        int sum = 0, prod = 1;
        while (n) {
            sum += n % 10;
            prod *= n % 10;
            n /= 10;
        }
        return prod - sum;
    }
};