Easy Approach
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
```cpp []
class Solution {
public:
    bool isFascinating(int n) {
        string s=to_string(n)+to_string(2*n)+to_string(3*n);
        if(s.size()>9)return false;
        vector<int> r;
        for(int i=0;i<9;i++){
            r.push_back(s[i]-'0');
        }
        sort(r.begin(),r.end());
        for(int i=0;i<9;i++){
            if(r[i]!=i+1){
                return false;
            }
        }
        return true;
    }
};
```
['C++']