Let the set be the CAM messages broadcast by the vehicle vj that have not expired, and the total number of CAM messages in the set received by the vehicle vi under the cooperative recovery strategy.
Set the collection to the CAM message that is broadcast by the vehicle vj and has not expired, and is the total number of CAM messages received in the collection by the vehicle vi under the collaborative recovery strategy.
Let the set be the cam messages broadcast by vehicle VJ and have not expired, which is the total number of cam messages received by vehicle VI under the collaborative recovery strategy.<br>