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.
Enjoy what you’re reading? Subscribe to my newsletter and get more content on AWS and serverless technologies delivered straight to your inbox.
I’m an AWS Serverless Hero and the author of Production-Ready Serverless. I have run production workload at scale in AWS for nearly 10 years and I have been an architect or principal engineer with a variety of industries ranging from banking, e-commerce, sports streaming to mobile gaming. I currently work as an independent consultant focused on AWS and serverless.
In this course, we’ll cover everything you need to know to use AWS Step Functions service effectively. Including basic concepts, HTTP and event triggers, activities, design patterns and best practices.
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.
- Lambda optimization tip – enable HTTP keep-alive
- You are thinking about serverless costs all wrong
- Many faced threats to Serverless security
- We can do better than percentile latencies
- I’m afraid you’re thinking about AWS Lambda cold starts all wrong
- Yubl’s road to Serverless
- AWS Lambda – should you have few monolithic functions or many single-purposed functions?
- AWS Lambda – compare coldstart time with different languages, memory and code sizes
- Guys, we’re doing pagination wrong