Given an integer num, return the number of digits in num that divide num.
An integer val divides nums if nums % val == 0.
\n
Example 1:
\n\n\nInput: num = 7\nOutput: 1\nExplanation: 7 divides itself, hence the answer is 1.\n\n\n
Example 2:
\n\n\nInput: num = 121\nOutput: 2\nExplanation: 121 is divisible by 1, but not 2. Since 1 occurs twice as a digit, we return 2.\n\n\n
Example 3:
\n\n\nInput: num = 1248\nOutput: 4\nExplanation: 1248 is divisible by all of its digits, hence the answer is 4.\n\n\n
\n
Constraints:
\n\n1 <= num <= 109num does not contain 0 as one of its digits.给你一个整数 num ，返回 num 中能整除 num 的数位的数目。
如果满足 nums % val == 0 ，则认为整数 val 可以整除 nums 。
\n\n
示例 1：
\n\n输入：num = 7\n输出：1\n解释：7 被自己整除，因此答案是 1 。\n\n\n
示例 2：
\n\n输入：num = 121\n输出：2\n解释：121 可以被 1 整除，但无法被 2 整除。由于 1 出现两次，所以返回 2 。\n\n\n
示例 3：
\n\n输入：num = 1248\n输出：4\n解释：1248 可以被它每一位上的数字整除，因此答案是 4 。\n\n\n
\n\n
提示：
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