Run code not working or I'm missing something obvious?

I'm trying to just test out this platform. I implemented fizzbuzz in c++:

class Solution {
public:
    vector<string> fizzBuzz(int n) {
        
        vector<string> f(n);

        for(unsigned a = 1; a <= n; ++a ) {

            string s = "";
            if(a % 3==0){
                s+="Fizz";
            }
            if(a % 5 ==0){
                s+="Buzz";
            }
            if(a % 3 != 0 && a % 5 !=0){
                s+=to_string(a);
            }

            f[a] = s;

            cout << f[a] << endl;

        }

        return f;
    }
};

And it works locally but when I run it here I get no output. What am I missing?

https://leetcode.com/problems/fizz-buzz/

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