codeforces/2175A.cpp at main · Nithin0306/codeforces · GitHub

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#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;

        set<int> colors;
        for (int i = 0; i < n; i++) {
            int x;
            cin >> x;
            colors.insert(x);
        }

        int distinct = colors.size();
        int previous = -1;


        while (true) {
            if (distinct == previous) {
                break;
            }

            previous = distinct;

            if (colors.count(distinct)) {
                break;
            }

            colors.insert(distinct);
            distinct = colors.size();
        }

        cout << distinct << endl;
    }

    return 0;
}