Abinesh B’s Post

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Software Engineer @ Salesforce | Ex-Zohoite

How preprocessing saves tons of time for ETA calculation | Contraction Hierarchies Hey folks! Have you ever wondered how apps like Uber always seem to find the fastest way to get you from point A to point B? Today, we're going to uncover a bit of that magic by talking about something called “Contraction Hierarchies”. Imagine a Giant City Map Think about a huge city map. There are roads everywhere, connecting different places. If you wanted to find the quickest route from your home to school, you'd have to look at all these roads and figure out which ones to take. Sounds like a lot of work, right? What Are Contraction Hierarchies? Now, let’s sprinkle a little magic on this map. Contraction Hierarchies (CH) are like a super-smart way of shrinking this giant map while still keeping all the best shortcuts. Here’s how it works: 1. Simplifying the Map: First, we start by removing the least important roads. Imagine you’re taking out all the tiny alleyways and leaving only the main roads. This makes the map less cluttered. 2. Adding Shortcuts: For every road we remove, we add some "shortcuts" to make sure we can still get everywhere quickly. It's like having secret passages that only show up when you need them. 3. Building Levels: We then rank the roads. Main highways get a higher rank than small streets. This ranking helps the algorithm to decide which roads to prioritize when finding the best route. How Does Uber Use This? Uber uses something very similar to find the quickest route for drivers and passengers. Here’s a simple breakdown: - Fast Decisions: By using Contraction Hierarchies, Uber’s system can make lightning-fast decisions about which route to take. It doesn't have to look at every single road—just the important ones and the secret shortcuts. - Handling Traffic: Traffic is like a surprise obstacle in a game. Uber can quickly recalculate routes if there’s a traffic jam because it has a simplified map with lots of hidden shortcuts ready to use. Why It’s So Cool Contraction Hierarchies are like having a superhero map that always knows the best way to go. They make sure you spend less time stuck in traffic and more time enjoying your pizza. So next time you hop in an Uber and zoom through the city, you’ll know a little secret about the magic behind the scenes. It's all about making smart choices fast, just like a pro gamer! Stay curious and keep exploring! #ContractionHierarchies #uber #pathfinder #etacalculation #GPS #GoogleMaps #RoutePlanning #NodeContraction #Pathfinding #Navigation #SystemDesign #AlgorithmOptimization #ComputerScience #TechInnovation #EfficientRouting

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