Author: Administrator

Welcome to the Digital Frontier

πŸš€ The universal signal reception station is now online. Welcome to Huachen’s cosmos! πŸš€ β€œπ‚π¨π§π§πžπœπ­π’π§π  𝐭𝐨 𝐭𝐑𝐞 ππžπ­π°π¨π«π€β€¦ βœ… πƒπšπ­πš

Administrator Administrator Published on 2025-01-28

System Design Study Note | Designing a Proximity Service (Yelp, Google Places)

πŸ“Œ 1️⃣ Introduction Proximity Service is a key component in many modern applications: Yelp: Find nearby restaurants and shops Google Places: Return ne

Administrator Administrator Published on 2025-05-31

LeetCode Study Note | Problem 743: Network Delay Time

πŸ“˜ 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,

Administrator Administrator Published on 2025-05-19

LeetCode Study Note | Problem 45: Jump Game II

🧩 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

Administrator Administrator Published on 2025-05-19

LeetCode Study Note | Problem 55: Jump Game

🧠 Problem Overview You’re given an integer array nums, where each element represents the maximum jump length from that position. Starting at index 0,

Administrator Administrator Published on 2025-05-19

LeetCode Study Note | Problem 198: House Robber

🏠 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

Administrator Administrator Published on 2025-05-18

LeetCode Study Note | Problem 207: Course Schedule

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

Administrator Administrator Published on 2025-05-17

LeetCode Study Note | Problem 994: Rotting Oranges

πŸ” 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

Administrator Administrator Published on 2025-05-17

LeetCode Study Note | Problem 200: Number of Islands

🌊 Problem Summary You are given a 2D grid consisting of '1's (land) and '0's (water). An island is formed by connecting adjacent lands horizontally o

Administrator Administrator Published on 2025-05-17
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