easy java solution using for loop
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 s= n+""+n*2+""+n*3;

        int[] arr=new int[10];
        for(int i=0;i<s.length();i++)
        {
            char c = s.charAt(i);
            arr[c-48]++;
        }
        for(int i=1;i<arr.length;i++)
        {
            if(arr[i]!=1)
               return false;
        }

       return true;
    }
}
```
['Java']