int scanAdj(int n, vector<vector<int>> arr) {
    bool x;
    cout << endl << "Enter data about people:" << endl;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (!(cin >> x)) {
                cout << "wrong data.";
                return Bad;
            }
            if (x) {
                arr[i].push_back(j);
            }
        }
    }
    return Ok;
}