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IEnumerable<T> traverse(Node current) {
    if (current != null)
    {
        foreach (var value in traverse(current.left))
            yield return value;

        yield return current.value;

        foreach (var value in traverse(current.right))
            yield return value;
    }
}

void update(unsigned dt) {
    if(tapSpeed >= minTapSpeed && tapSpeed <= maxTapSpeed)
        playerSpeed += dt * k1;
    else
        playerSpeed -= dt * k2;
    tapSpeed -= dt * k3;
}

void onTap() {
    tapSpeed += k4;
}