C++ code:

include

include

include

include

using namespace std;

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

while (querySize--) {
    int n, m;
    cin >> n >> m;

    vector<list<int>> graph(n + 1);
    vector<int> visited(n + 1, 0);
    vector<int> store(n + 1, -1);

    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
    }

    int s;
    cin >> s;

    queue<int> q;
    q.push(s);
    visited[s] = 1;
    store[s] = 0;

    while (!q.empty()) {
        int k = q.front();
        q.pop();

        for (auto adj : graph[k]) {
            if (!visited[adj]) {
                visited[adj] = 1;
                store[adj] = store[k] + 6;
                q.push(adj);
            }
        }
    }

    // Output without trailing space
    bool first = true;
    for (int i = 1; i <= n; i++) {
        if (i == s) continue;
        if (!first) cout << " ";
        cout << store[i];
        first = false;
    }
    cout << endl;
}

return 0;

}