TIME COMPLEXITY - O(1)
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```java []
class Solution {
    public boolean isFascinating(int n) {
        String one = Integer.toString(n);
        String two = Integer.toString(n * 2);
        String three = Integer.toString(n * 3);

        String s = one + two + three;

        char[] charArr = s.toCharArray();
        Arrays.sort(charArr);

        String str = new String(charArr);

        return str.equals("123456789");


    }
}
```
['Java']