Check out my new course Learn you some Lambda best practice for great good! and learn the best practices for performance, cost, security, resilience, observability and scalability.
Description for today’s challenge is here.
This is a modified version of the Day 6 challenge, with a twist of course.
So, we’ll start by creating a 100×100 2D array to represent our grid of lights. As per the instruction, we’ll read the input and use # to set the original state of a light to ON, and . to set the original state of a light to OFF.
Next, let’s add a function to count the number of neighbours that are ON, whilst taking into account that lights on the edge of the grid won’t have all 8 neighbours:
Then we’ll simulate 100 steps, each step would use the state from the previous step in a fold:
Finally, count the number of lights that are ON in the state after 100 steps:
All else stays the same, we just need to inject additional logic to check if the light is one of the corner lights in a few places.
First, let’s add a function to determine if a light is in the corner:
and now we need to use it when setting the initial state for our grid:
as well as when we step from one state to the next:
and that’s it. After you made these couple of changes, all the rest of the code from Part 1 would work like before.
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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!
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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.
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