🏠 Welcome to huachenwang.net — my digital workspace and learning archive This blog is my personal corner on the internet — a place where I document w
This note summarizes the system design and technical insights from building a banking customer service assistant powered by retrieval-augmented genera
📌 1️⃣ Introduction Proximity Service is a key component in many modern applications: Yelp: Find nearby restaurants and shops Google Places: Return ne
📘 Problem Overview You are given a directed, weighted graph with n nodes (1-indexed), and a list of travel times times, where each element is [u, v,
🧩 Problem Summary You are given an integer array nums where each element represents your maximum jump length at that position. Your goal is to return
🧠 Problem Overview You’re given an integer array nums, where each element represents the maximum jump length from that position. Starting at index 0,
🏠 Problem Overview You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, but adjacen
Problem Summary You are given numCourses courses labeled from 0 to numCourses - 1, and a list of prerequisites where each element is a pair [a, b] mea
🔍 Problem Overview You’re given an m x n grid, where: 0 represents an empty cell 1 represents a fresh orange 2 represents a rotten orange Each minute
