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How to Read Constraints and Immediately Know the Algorithm: A Jedi's Guide

The Quest Begins (The "Why") I still remember the first time I stared at a competitive‑programming statement and felt my brain short‑circuit. The problem talked about “arrays of length n where each element is at most 10⁹ and you need to count pairs whose sum is divisible by k”. I started scribbling brute‑force loops, then switched to sorting, then tried hash maps… and after twenty minutes I was still staring at a blank editor, wondering if I’d missed some hidden trick. Sound familiar? You’re

programmingproblemsolvingcoding
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ExternalSoftware Engineering
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Open Codex app from the macOS Terminal with the Current Project Selected

I wanted a quick way to open Codex app directly from the macOS terminal with the current project folder already selected. Add the following function to your local Zsh config file, such as ~/.zshrc. It opens a new Codex thread using the current directory as the workspace. You can also pass a directory path as an argument. This assumes Codex app is installed on macOS. It uses python3 only to URL-encode the local path safely. # Open Codex app with the current directory as a new thread workspace. #

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ExternalSoftware Engineering
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Agent = Model x Harness: Your Eval Layer Is Part of the Agent, Not a Tool Beside It

There's a formula I keep coming back to when people ask why their slick demo agent falls apart in production: Agent = Model × Harness The model is the raw reasoning — Claude, GPT, whatever. It's swappable, and it's getting better on a curve you don't control. The harness is everything else: the goals, the loops, the tools, the scheduler, the retry logic. Most of the engineering that matters lives in the harness, not the model. But here's the part most teams get wrong. They define the harness as

aiagentsevaluation
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ExternalSoftware Engineering
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How I Passed AWS SAP-C02 in Just 3 Days

When I tell people I passed the AWS Certified Solutions Architect – Professional (SAP-C02) exam after only three days of preparation, the first reaction is usually: "There's no way you learned SAP-C02 in three days." And they would be right. I didn't start from zero. I already had several years of hands-on AWS experience and had previously passed SAA-C03. What I needed wasn't months of learning AWS services—it was three days of focused exam preparation to bridge the gap between real-world experi

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ExternalSoftware Engineering
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AI Now Recommends Local Businesses. Most Are Invisible.

Forty-five percent of consumers now use an AI assistant to find a local service, up from six percent a year ago. In the same window, ChatGPT was measured recommending just 1.2 percent of all local business locations. Put those two numbers next to each other and you have the local-search story of 2026 in a sentence: people are asking AI which plumber, which restaurant, which estate agent to use, and for almost every business the answer it gives does not include them. The old game was ranking on a

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