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Segment Trees: The “Divide‑and‑Conquer” Trick That Actually Makes Sense

Segment Trees: The “Divide‑and‑Conquer” Trick That Actually Makes Sense Quick context (why you're writing this) I remember the first time I saw a segment tree in an interview prep book. The diagram looked like a binary tree slapped onto an array, and the explanation was basically “just trust me, it works.” I spent three hours staring at the picture, trying to convince myself that the magic wasn’t just a clever coincidence. When I finally walked through a concrete example—say, asking

algorithmsdatastructuresprogramming
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First Post

I was looking for a platform to document my journey toward becoming an AI researcher, and I finally ended up at dev.to. I’ll be posting about the things I try — what works, what fails, and the thought process behind each experiment. I also want to dive into the research and reasoning behind why certain approaches succeed while others don’t. Hopefully, this helps me keep track of everything I’ve been working on, while also connecting me with people who enjoy the kind of work I do — and with those

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ExternalSoftware Engineering
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The AI-Powered Classifieds Stack That Posts in Seconds

The AI-Powered Classifieds Stack That Posts in Seconds Users can upload a photo to 24ad.info. AI assists with the listing details. The ad goes live before any manual steps are complete. Here's how the stack works. When you upload photos: // Simplified image analysis flow const analysis = await openRouter.chat.completions.create({ model: "google/gemini-2.5-flash", messages: [{ role: "user", content: [ { type: "image_url", url: uploadedImage }, "Describe this item for

aiautomationjavascript
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ExternalSoftware Engineering
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Async Event Processing Architectures for Shopify — A Developer's Guide

Synchronous processing kills Shopify scalability. Every blocked operation is a timeout waiting to happen. This guide covers the async event processing patterns that production Shopify systems actually use. We'll go from webhook receiver basics all the way to saga orchestration and event sourcing. Shopify fires webhooks for orders, fulfillments, inventory changes, customer updates, and more. If you process these synchronously inside your endpoint, you will hit timeouts, lose data, and bring down

shopifyjavascriptwebdev
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ExternalSoftware Engineering
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I Built a Live UK Electricity Price Dashboard. Here's What Went Wrong (and Right)

I'm on Agile Octopus, where electricity prices change every 30 minutes. Every evening I'd open the Octopus app trying to figure out when to run the dishwasher. The app shows you the rates, but not "the cheapest 2-hour window tonight", which is the thing you actually need to know when you're standing in the kitchen at 8pm. So I built ukelectricityprices.co.uk. A dashboard that shows live half-hourly prices, finds the cheapest slots for appliances, and compares tariffs across all 14 UK regions. Ne

nextjstypescriptapi
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ExternalSoftware Engineering
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The #1 Developer Skill in the Agentic Era

At first, many dismissed AI as a temporary bubble, but now that engineering organizations are adopting agentic workflows at scale, it is much harder to negate this new reality. Naturally, this shift has triggered a wave of industry anxiety. Engineers are looking at the landscape and asking a frantic question: What skills do I need to keep my job? For decades, developers prided themselves on memorizing syntax, writing algorithms from scratch, and passing LeetCode interviews by repeating patterns.

aiagentsagentskills
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Node.js "type": "module" vs CommonJS: 7 Real Errors and the .cjs/.mjs Fix Map (2026)

⚠️ この記事はアフィリエイト広告（プロモーション）を含みます。リンク先で発生した収益の一部が運営者に支払われますが、読者の購入価格には一切影響ありません。 If you just added "type": "module" to package.json and your test runner died with ERR_REQUIRE_ESM, this article gets you back to green in about 15 minutes. By the end you'll have a copy-pasteable decision map for .js / .cjs / .mjs, a working dual-format build, and the three config files (Jest, ESLint, a small CLI) that break most often — with the exact error strings so you can Ctrl+F your stack trace. I migrated a 42-

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