2520. Count the Digits That Divide a Number
Given an integer num, return the number of digits in num that divide num.
An integer val divides nums if nums % val == 0.
Examples
Example 1
Input: num = 7
Output: 1
Explanation: 7 divides itself, hence the answer is 1.
Example 2
Input: num = 121
Output: 2
Explanation: 121 is divisible by 1, but not 2. Since 1 occurs twice as a digit, we return 2.
Example 3
Input: num = 1248
Output: 4
Explanation: 1248 is divisible by all of its digits, hence the answer is 4.
Constraints
1 <= num <= 109num does not contain 0 as one of its digits.