Time limit in a test case

Here is the link of the problem https://cses.fi/problemset/task/1621/

And this is my code

int main()
    ll n;

    cin >> n;
    unordered_set<int> s;

    for (int i = 0; i < n; i++)
        ll x;

        cin >> x;
    cout << s.size() << endl;

I have time limit in one of the test cases

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