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 <= 10^5struct Solution;
impl Solution {
fn subtract_product_and_sum(mut n: i32) -> i32 {
let mut product = 1;
let mut sum = 0;
while n != 0 {
let d = n % 10;
product *= d;
sum += d;
n /= 10;
}
product - sum
}
}
#[test]
fn test() {
assert_eq!(Solution::subtract_product_and_sum(234), 15);
}