A service publishes real-time data about freshly available concert tickets before anybody else. To be fast, they publish the information packet by packet.

Your bucket list contains concerts for the artists you want to see (on_receive_requirements function). You have also decided that you are willing to pay up to a certain ticket price, but no more. Finally, concerts are only worth going to with friends, so you want to buy at least a certain number of available seats per concert.

The service will send AvailableTicket messages split into multiple packets. The service also provides an API to submit an Order to buy a ticket. Orders must also be sent packet by packet.

AvailableTicket Message Format

Packet 1: Message ID and Artist ID
Packet 2: Message ID and Ticket Price
Packet 3: Message ID and Available Seats

Notes

• message_id is the same for all packets of the same message.
• message_id is unique and is not reused.
• The order of packets for a given message_id is guaranteed, but packets from different messages may be interleaved.

Order Response Format

Packet 1: Artist ID
Packet 2: Number of seats to purchase

Task

Write a program to listen to available tickets and buy tickets matching your criteria as soon as they become available.

Complete the following functions

class ConcertTickets:
    def __init__(self):
        pass
    
    def on_receive_requirements(self, artist_id, max_price, min_seats):
        pass
    
    def process_packet(self, message_id, data) -> int:
        # return int to send Order response packet. 0 if nothing to send.
        pass

This program should efficiently track available tickets and submit an order as soon as a ticket matches the given requirements.

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