junueno.dev - articles (EN)

The narration audio had slightly weird pitch accent.

On one of my side projects, I wanted to put some Google Apps Script (GAS) under Git.

I publish this blog in two languages.

The scariest bug in a backtest (the thing that estimates a strategy's returns on past price moves) isn't a crash.

I run a project where I make vertical short-form videos and ship them.

I build explainer videos fully automatically.

I let an AI agent run the social media for my own product.

I run an AI agent (Claude Code) that produces content and takes it all the way to publishing on external platforms, on its own.

I'm building an app with Claude Code right now.

I run an automated video pipeline that generates images locally, on my Mac.

I run a little pipeline that builds history-explainer videos end to end — script, narration, images, video — all automatically, all by myself.

My project's docs had rules.

One morning, an email landed.

I'll confess up front: this is basically a sequel to my earlier piece, the one where an AI decided it was being hacked when nobody was attacking it, and spiraled.

There's a small corporate site.

Same old story: I'm running the SaaS our CFO shipped to production in two days.

One evening, a monitoring alert went off: a server behind a web service was down.

Let me confess something a little creepy.

There's a B2B SaaS that a non-engineer executive built all the way to production in two days , by handing everything to an AI.

One morning, a bunch of EC shops sharing a single server all tripped their monitors at once with "response timeout."

This is the story of how a mundane complaint — "the VPN is slow" — turned into a US patent application.

Problem Given an integer array, return the length of the longest strictly increasing subsequence.

Problem Given two strings, find the length of their longest common subsequence.

Problem Given a list of weights and values and a total capacity, determine the maximum value that can be placed in the knapsack. 2D DP 1D DP (space optimized)

Introduction Dynamic Programming is an efficient algorithm design technique used to solve problems by breaking them down into smaller subproblems.

Introduction Dynamic Programming is an efficient algorithm design technique used to solve problems by breaking them down into smaller subproblems.

Introduction Segment Tree is an efficient tree data structure for dynamic range queries.

The following Python code finds perfect numbers within a given range: Running this code will output perfect numbers such as 6, 28, 496, and 8128. --- Efficient Perfect Number Checking Using Mersenne…

Versions Homebrew 3.4.7 Nginx 1.21.6 Ngrok 3.0.2 About Ngrok - A tool that makes the specific port of local machine public on internet - Pricing: Free for personal use - Official website: https://ngr…

Versions Homebrew 3.4.7 Nginx 1.21.6 Ngrok 3.0.2 AWS CLI 2.5.8 About AWS ECR AWS ECR is a repository service like DockerHub.

URL: https://leetcode.com/problems/longest-substring-without-repeating-characters Difficulty: Medium Problem Statement Given a string, find the length of the longest substring without repeating chara…

We can declare variables with let. let binds variables.

Let's implement an efficient function to compute the greatest common divisor using recursion in Python.

Let's implement an efficient power function using recursion in Python.

https://leetcode.com/problems/remove-duplicates-from-sorted-array Difficulty: Easy This is easy problem.

https://leetcode.com/problems/divide-two-integers Difficulty: Medium In this article, I will explain how to solve the problem Divide Two Integers with Timothy H Chang's solution.

https://leetcode.com/problems/maximum-number-of-vowels-in-a-substring-of-given-length Reference Code: [[Java/Python 3] Slide Window O(n) codes](https://leetcode.com/problems/maximum-number-of-vowels-…

https://leetcode.com/problems/length-of-last-word Very easy problem.

State In React, state is a data that is stored in the component.

Effects We can perform data fetching, subscribing, and manually changing DOM from React components.

Context Context in React.js provides a way to pass data through the components without props.

Prepare Docker Image at ECR If you don't have an image at ECR, please check this article and get it.

https://leetcode.com/problems/sqrtx My answer was O(n), so the execution time was too long.

URL: https://leetcode.com/problems/intersection-of-two-arrays Difficulty: Easy This is a simple and easy problem.

URL: https://leetcode.com/problems/132-pattern Difficulty: Medium Even though the tag of this problem is "Binary Search", you can solve this problem without using binary search.

Binary search is an algorithm to check if a target number exists in a list.

Versions OS: MacOS (intel chip) Docker version: 20.10.12 Official image of Nginx Nginx distribute its official Docker image on Docker Hub. https://hub.docker.com/ /nginx How to 1.

Versions Node version: 16.13.0 Docker version: 20.10.12 Link GitHub Repo https://github.com/jun-uen0/react-dockerfile Here’s How to Dockerize React App https://www.bacancytechnology.com/blog/dockeriz…