Marked Too Late

This BFS marks a vertex visited when it is popped, not when it is pushed.

vector<int> bfs(int s, const vector<vector<int>>& adj) {
    int n = adj.size();
    vector<int> d(n, -1);
    vector<bool> visited(n, false);
    queue<int> q;
    q.push(s);
    d[s] = 0;
    while (!q.empty()) {
        int v = q.front(); q.pop();
        if (visited[v]) continue;
        visited[v] = true;
        for (int u : adj[v]) {
            if (!visited[u]) {
                d[u] = d[v] + 1;
                q.push(u);
            }
        }
    }
    return d;
}

Run it on the triangle 0-1, 0-2, 1-2 from source 0, with each adjacency list in increasing order. What is returned?