FlipKart | Phone | Machine Coding: Covid Tracker
LeetCanCode
6295
FlipkartInterviewSenior Level

Duration

  • 30 mins => Introduction. Panel explained the problem statement. We can ask any questions if we have.
  • 90 mins => Coding
  • 30 mins => Review + Demo

Problem Statement
Design an application called Covid Tracker.

Write code which tracks the Covid records. The code should be demonstrable.

Must Have Cases:

Register and Login
Admin and regular users should be able to register and login

Covid Cases
Admin should be able to add / update / delete regular user Covid data

Self Assessment
User should be able to assess themselves.

Assessment factors:
A. Not vaccinated
B. Came in contact with Covid patient
C. Visited covid red zone

  • If A & B & C => 100 % chance of being Covid Positive
  • A & B or A & C => 50 %
  • B & C => 75 %

Covid Zones
I used area pincode to decide the region.

RED Zone: >=75 % cases
Orange Zone: 25 % <= cases <= 75 %
GREEN Zone: <25 %

Bonus Cases

After completing above cases, you can consider adding more features to the app like supporting more Covid factors, displaying the Covid zones based on date ranges, etc. Please note that bonus cases are good to have and not mandatory.

Some Tips:

  • Code should be modular
  • Code should be readable
  • It should be extensible. The panel mostly asks to add some extra feature to the app. We should be able to extend it easily.
  • It should follow SOLID principles
  • Use Design Patterns wherever possible
  • Proper validations and exception handling wherever possible
  • Proper packaging structure
  • Terminal application is fine. You can simply consider the class with main method as driver class and provide the inputs to the methods from there itself. You can also use file to accept inputs(good to have). You can also develop REST API if you can quickly write it(This is not recommended if the round is online as it might unnecessarily introduce other issues, better go for driver class).

Sample I/O I used

register user 8329573115 411021
register admin 8329573016 411021
selfassessment 8329573115 y y n
covidresult 8329573016 8329573115 y
covidresult 8329573011 8329573117 n
getzone 411021

Hopefully I was able to clear the machine coding round but had hard luck for the third round.

How to Prepare ?
Go through this article to know more.

Thanks and all the best!

I've also gone through other companies machine coding rounds and successfully cleared the rounds.
Upvote if you find this question helpful and want me to post other questions as well.

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