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Main v2
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Main v2
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import heapq
class Passenger:
def __init__(self, start_station, destination_station, request_time):
self.start_station = start_station
self.destination_station = destination_station
self.request_time = request_time
self.priority = None # Will be calculated dynamically
self.arrival_time = None # Time when the passenger reaches their destination
self.boarding_time = None # Time when the passenger boards the train
def __lt__(self, other):
return self.priority < other.priority
class Emergency:
def __init__(self, start_station, destination_station, request_time):
self.start_station = start_station
self.destination_station = destination_station
self.request_time = request_time
self.arrival_time = None # Time when the emergency reaches their destination
self.boarding_time = None # Time when the emergency boards the train
class TrainSystem:
def __init__(self):
self.stations = ['A', 'B', 'C', 'D']
self.passenger_requests = []
self.emergency_requests = []
self.current_time = 1 # Start time from 1
self.train_location = 'A'
self.passenger_queue = []
self.onboard_passengers = []
self.onboard_emergencies = []
self.total_travel_time = 0
self.total_passengers = 0
def station_distance(self, start, end):
return abs(self.stations.index(start) - self.stations.index(end))
def calculate_priority(self, passenger):
passenger.priority = self.station_distance(self.train_location, passenger.destination_station)
def add_passenger_request(self, passenger):
self.passenger_requests.append(passenger)
self.passenger_requests.sort(key=lambda x: x.request_time)
def add_emergency_request(self, emergency):
self.emergency_requests.append(emergency)
self.emergency_requests.sort(key=lambda x: x.request_time)
def get_next_station(self, destination):
current_index = self.stations.index(self.train_location)
dest_index = self.stations.index(destination)
if current_index < dest_index:
return self.stations[current_index + 1]
elif current_index > dest_index:
return self.stations[current_index - 1]
else:
return self.train_location
def move_train(self, destination):
next_station = self.get_next_station(destination)
if self.train_location != next_station:
self.train_location = next_station
print(f"Time {self.current_time}: Train moved to station {self.train_location}")
def process_boarding(self):
# Board passengers
passengers_to_board = [p for p in self.passenger_requests
if p.start_station == self.train_location and p.request_time <= self.current_time]
for passenger in passengers_to_board:
self.calculate_priority(passenger)
passenger.boarding_time = self.current_time
self.passenger_requests.remove(passenger)
self.onboard_passengers.append(passenger) # Add directly to onboard_passengers
print(f"Time {self.current_time}: Passenger boarded at station {self.train_location} going to {passenger.destination_station}")
def process_alighting(self):
# Alight emergencies first
for emergency in self.onboard_emergencies[:]:
if emergency.destination_station == self.train_location:
emergency.arrival_time = self.current_time
self.onboard_emergencies.remove(emergency)
travel_time = emergency.arrival_time - emergency.boarding_time
self.total_travel_time += travel_time
self.total_passengers += 1
print(f"Time {self.current_time}: Emergency alighted at station {self.train_location}, travel time {travel_time}")
# Alight passengers
for passenger in self.onboard_passengers[:]:
if passenger.destination_station == self.train_location:
passenger.arrival_time = self.current_time
self.onboard_passengers.remove(passenger)
travel_time = passenger.arrival_time - passenger.boarding_time
self.total_travel_time += travel_time
self.total_passengers += 1
print(f"Time {self.current_time}: Passenger alighted at station {self.train_location}, travel time {travel_time}")
def handle_emergencies(self):
# Collect emergencies whose request_time <= current_time
pending_emergencies = [e for e in self.emergency_requests if e.request_time <= self.current_time]
# Remove them from emergency_requests
for emergency in pending_emergencies:
self.emergency_requests.remove(emergency)
while pending_emergencies or self.onboard_emergencies:
# Handle pending emergencies
if pending_emergencies:
# Pick the emergency with the earliest request time
emergency = min(pending_emergencies, key=lambda e: e.request_time)
# Move train to the emergency's start station
while self.train_location != emergency.start_station:
self.current_time += 1
self.move_train(emergency.start_station)
self.process_alighting()
self.process_boarding()
# Check for new emergencies during movement
new_emergencies = [e for e in self.emergency_requests if e.request_time <= self.current_time]
for e in new_emergencies:
self.emergency_requests.remove(e)
pending_emergencies.append(e)
# Board the emergency
emergency.boarding_time = self.current_time
self.onboard_emergencies.append(emergency)
pending_emergencies.remove(emergency)
print(f"Time {self.current_time}: Emergency boarded at station {self.train_location} going to {emergency.destination_station}")
# Deliver onboard emergencies
if self.onboard_emergencies:
emergency = self.onboard_emergencies[0]
# Move train to emergency's destination
while self.train_location != emergency.destination_station:
self.current_time += 1
self.move_train(emergency.destination_station)
self.process_alighting()
self.process_boarding()
# Check for new emergencies during movement
new_emergencies = [e for e in self.emergency_requests if e.request_time <= self.current_time]
if new_emergencies:
for e in new_emergencies:
self.emergency_requests.remove(e)
pending_emergencies.append(e)
break # Break to handle new emergency
# Process alighting when we reach the destination
self.process_alighting()
# Remove emergency from onboard_emergencies if they have alighted
if emergency in self.onboard_emergencies and self.train_location == emergency.destination_station:
self.onboard_emergencies.remove(emergency)
def handle_passengers(self):
while self.onboard_passengers:
# Choose the passenger with the highest priority (closest destination)
self.onboard_passengers.sort(key=lambda p: self.station_distance(self.train_location, p.destination_station))
passenger = self.onboard_passengers[0]
print(f"Time {self.current_time}: Handling passenger from {passenger.start_station} to {passenger.destination_station}")
# Move train to passenger's destination
while self.train_location != passenger.destination_station:
self.current_time += 1
# Before moving, check for new emergencies
pending_emergencies = [e for e in self.emergency_requests if e.request_time <= self.current_time]
if pending_emergencies:
# Handle emergencies
self.handle_emergencies()
break # Break to reprocess the passenger loop
self.move_train(passenger.destination_station)
self.process_alighting()
self.process_boarding()
# Process alighting when we reach the destination
self.process_alighting()
# Remove passenger from onboard_passengers if they have alighted
if passenger in self.onboard_passengers and self.train_location == passenger.destination_station:
self.onboard_passengers.remove(passenger)
def run(self):
# Start simulation
while (self.passenger_requests or self.emergency_requests or self.onboard_passengers or
self.onboard_emergencies):
self.process_alighting()
self.process_boarding()
# Collect any new emergencies whose request_time <= current_time
pending_emergencies = [e for e in self.emergency_requests if e.request_time <= self.current_time]
if pending_emergencies or self.onboard_emergencies:
self.handle_emergencies()
elif self.onboard_passengers:
self.handle_passengers()
elif any(p.request_time <= self.current_time for p in self.passenger_requests):
# Move train towards the earliest passenger request
pending_passengers = [p for p in self.passenger_requests if p.request_time <= self.current_time]
if pending_passengers:
# Choose the closest passenger request
closest_passenger = min(pending_passengers, key=lambda p: self.station_distance(self.train_location, p.start_station))
# Move towards the closest passenger
while self.train_location != closest_passenger.start_station:
self.current_time += 1
self.move_train(closest_passenger.start_station)
self.process_alighting()
self.process_boarding()
# Check for new emergencies during movement
if any(e.request_time <= self.current_time for e in self.emergency_requests):
break
else:
# No pending passenger requests ready yet, advance time
self.current_time += 1
else:
# No one to handle, advance time
self.current_time += 1
if self.total_passengers > 0:
average_travel_time = self.total_travel_time / self.total_passengers
print(f"\nAverage travel time: {average_travel_time}")
else:
print("No passengers or emergencies were processed.")
def main():
train_system = TrainSystem()
print("Welcome to the Train Simulation System")
while True:
print("\nMenu:")
print("1. Add Passenger Request")
print("2. Add Emergency Request")
print("3. Start Simulation")
choice = input("Please select an option (1-3): ")
if choice == '1':
try:
request_time = int(input("Enter request time: "))
start_station = input("Enter start station (A-D): ").upper()
destination_station = input("Enter destination station (A-D): ").upper()
if start_station not in train_system.stations or destination_station not in train_system.stations:
print("Invalid station. Please try again.")
continue
if start_station == destination_station:
print("Start and destination stations cannot be the same. Please try again.")
continue
passenger = Passenger(start_station, destination_station, request_time)
train_system.add_passenger_request(passenger)
except ValueError:
print("Invalid input. Please enter numeric values for time.")
elif choice == '2':
try:
request_time = int(input("Enter request time: "))
start_station = input("Enter start station (A-D): ").upper()
destination_station = input("Enter destination station (A-D): ").upper()
if start_station not in train_system.stations or destination_station not in train_system.stations:
print("Invalid station. Please try again.")
continue
if start_station == destination_station:
print("Start and destination stations cannot be the same. Please try again.")
continue
emergency = Emergency(start_station, destination_station, request_time)
train_system.add_emergency_request(emergency)
except ValueError:
print("Invalid input. Please enter numeric values for time.")
elif choice == '3':
print("Starting simulation...")
train_system.run()
break
else:
print("Invalid choice. Please select 1, 2, or 3.")
if __name__ == "__main__":
main()