1. Data Structures and Algorithms
Prof. Ajit A. Diwan
Prof. Ganesh Ramakrishnan
Prof. Deepak B. Phatak
Department of Computer Science and Engineering
IIT Bombay
Session: Mumbai Vada-Pav Restaurant
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

2. Mumbai Vada-Pav Restaurant: Overview
This restaurant has
Fixed food items in the menu
One counter (queue) for customer to place order
Every customer can place order for Maximum 10 items
Quantity must be specified for each item
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

3. Customer Arrives and stands in a queue Places order on his/her turn
Gets a Token ID and cost to be paid
Waits at a table to collect the order when it is ready
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

4. Data Structures
Restaurant maintains information of each item in the menu
Food ID (e.g. 1)
Food Name (e.g. Samosa)
Rate per item (e.g. Rs. 15.0)
We will use structure ‘foodInfo’ to maintain this information
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

5. Data Structures Structure: foodInfo Food ID Food Name Rate 1 Vada Pav
10.0 2
Uttappa
18.0 3
Samosa
15.0 … 12
Shira
26.0
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

6. Data Structures using Queues
Use queues to facilitate the process
Queue 1: Customer Queue
Places order by giving (multiple)
Food ID and
Quantity
Gets Token ID
Cost to be paid
Queue 2: Order Dispatch Queue
Token ID (The order is ready to be collected by the customer)
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

7. Data Structure for the kitchen
Each order placed by a customer is sent to kitchen
Kitchen will prepare the ordered items
different time needed to prepare an order
Orders may not be prepared in their arrival sequence
For now, we use a simple array to represent kitchen operations
Each element of the array will have
Token-id
Time for preparation
We will store every element of order queue in this array
For now, we will allocate an arbitrary time for order preparation
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

8. Let us demonstrate the entire process
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

9. Demonstration CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

10. Demonstration CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

11. Demonstration CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

12. Demonstration CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

13. Demonstration CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

14. Demonstration Order placed Token: 1001 Preparation started in kitchen
foodID Qty
Token: 1001
Cost: 165
CustomerOrder Queue
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

15. Demonstration Order placed Token: 1002
Preparation started in the kitchen
foodID Qty
Token: 1002
Total Cost: 100
CustomerOrder Queue T
1001
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

16. Demonstration Order placed Token: 1003
Preparation started in the kitchen
foodID Qty
Token: 1003
Total Cost: 19
CustomerOrder Queue T
1002 T
1001
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

17. Demonstration Order placed Token: 1004
Preparation started in the kitchen
foodID Qty
Token: 1004
Total Cost: 40
CustomerOrder Queue T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

18. Demonstration Items are being prepared in the kitchen
CustomerOrder Queue T
1004 T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

19. Demonstration Kitchen OrderDispatch Queue CustomerOrder Queue 1001 T
1004 T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

20. Demonstration Kitchen OrderDispatch Queue CustomerOrder Queue 1003
1001
CustomerOrder Queue T
1004 T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

21. Demonstration Kitchen OrderDispatch Queue CustomerOrder Queue 1003
1002
1003
1001
CustomerOrder Queue T
1004 T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

22. Demonstration Kitchen OrderDispatch Queue CustomerOrder Queue 1004
1002
1003
1001
CustomerOrder Queue T
1004 T
1002 T
1001 T
1003
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

23. References All images are taken from https://openclipart.org
Which are released in public domain
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay

24. Thank you
Ajit A. Diwan, Ganesh Ramakrishnan, and Deepak B. Phatak, IIT Bombay