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Description for today’s challenge is here.
This challenge involves a lot of calculations with km, seconds, km/s, etc. so let’s define these units:
Since a reindeer can be either resting, or flying, let’s capture that as its status:
and finally, let’s capture other important info such as speed, how long a reindeer can fly/rest for, etc:
The input to this challenge looks like this:
Rudolph can fly 22 km/s for 8 seconds, but then must rest for 165 seconds.
Cupid can fly 8 km/s for 17 seconds, but then must rest for 114 seconds.
Prancer can fly 18 km/s for 6 seconds, but then must rest for 103 seconds.
so let’s parse each line into a new State for a reindeer:
couple of things to note from the above:
- Distance is initialized at 0<km>
- Status is initialized as Flying 0<s>, as in ‘has flown for 0 seconds’
Next, let’s simulate how the state of a reindeer transitions from one second to the next:
this should seem pretty straightforward, the only thing worth pointing out is that when Status transitions from Resting => Flying and Flying => Resting, the new status is associated with 1<s> rather than 0<s>. That’s because in the second that has just passed (between the start of the function and the end), we have actually been in the new status.
e.g. at the start of the function, we deemed that we have already flown for the max amount of time possible, so for the duration of this second, we’ll be resting, which is why our Distance hasn’t changed and why by the end of the function, we’ll have rested for 1 second.
Finally, let’s run this simulation for 2503 seconds and find the furthest Distance of all the reindeer:
Part 2 introduces a new concept of Score, so let’s update our model:
and at the end of each round of simulation, we’ll need to award the reindeer that has flown the furthest with a point each:
and finally, we’re looking for the highest Score instead of the furthest Distance:
Hi, I’m Yan. I’m an AWS Serverless Hero and I help companies go faster for less by adopting serverless technologies successfully.
Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.
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My 4-week Production-Ready Serverless online workshop is back!
This course takes you through building a production-ready serverless web application from testing, deployment, security, all the way through to observability. The motivation for this course is to give you hands-on experience building something with serverless technologies while giving you a broader view of the challenges you will face as the architecture matures and expands.
We will start at the basics and give you a firm introduction to Lambda and all the relevant concepts and service features (including the latest announcements in 2020). And then gradually ramping up and cover a wide array of topics such as API security, testing strategies, CI/CD, secret management, and operational best practices for monitoring and troubleshooting.
If you enrol now you can also get 15% OFF with the promo code “yanprs15”.
Check out my new podcast Real-World Serverless where I talk with engineers who are building amazing things with serverless technologies and discuss the real-world use cases and challenges they face. If you’re interested in what people are actually doing with serverless and what it’s really like to be working with serverless day-to-day, then this is the podcast for you.
Check out my new course, Learn you some Lambda best practice for great good! In this course, you will learn best practices for working with AWS Lambda in terms of performance, cost, security, scalability, resilience and observability. We will also cover latest features from re:Invent 2019 such as Provisioned Concurrency and Lambda Destinations. Enrol now and start learning!
Check out my video course, Complete Guide to AWS Step Functions. In this course, we’ll cover everything you need to know to use AWS Step Functions service effectively. There is something for everyone from beginners to more advanced users looking for design patterns and best practices. Enrol now and start learning!
Here is a complete list of all my posts on serverless and AWS Lambda. In the meantime, here are a few of my most popular blog posts.
- All you need to know about caching for serverless applications
- Lambda optimization tip – enable HTTP keep-alive
- You are wrong about serverless and vendor lock-in
- You are thinking about serverless costs all wrong
- Just how expensive is the full AWS SDK?
- Check-list for going live with API Gateway and Lambda
- How to choose the right API Gateway auth method
- CloudFormation protip: use !Sub instead of !Join
- AWS Lambda – should you have few monolithic functions or many single-purposed functions?
- Guys, we’re doing pagination wrong
- Top 10 Serverless framework best practices
- How to break the “senior engineer” career ceiling
- My advice to junior developers