[LeetCode] Check if The Number is Fascinating

2729. Check if The Number is Fascinating You are given an integer n that consists of exactly 3 digits. We call the number n fascinating if, after the following modification, the resulting number contains all the digits from 1 to 9 exactly once and does not contain any 0‘s: Concatenate n with the numbers 2 * n and 3 * n. Return true if n is fascinating, or false otherwise. Concatenating two numbers means joining them together. For example, the concatenation of 121 and 371 is 121371. ...

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