Jay's Dev Blog

[CS fundamentals] Greedy - Dijkstra, Kruskal and Prim's Algorithm
Introduction In this article, we will look at popular greedy algorithms, which are Dijkstra, Kruskal and Prim's Algorithm. Think about how Google Maps finds the shortest path from your home to your fa
Jul 22, 20266 min read
[CS fundamentals] Linked List Creation & Insertion explained in C.
Introduction In this article, we will look at fundamentals of linked lists. Linked list is a really powerful data structure especially when you deal with insertion and deletion. Imagine an array with
May 18, 20268 min read
Jay's Dev Blog
91 posts
Consistency is what transforms average to excellence.
[CS Fundamentals] Pointers in C
Introduction In this article, I will be talking about pointers in C. Pointers might be a bit hard concept for beginners, but they are essential to understand what your programs are doing. Moreover, th
Mar 25, 20265 min read
[SQL] Writing Efficient SQL Queries
Think of yourself building a program. It can be any types, such as website, app, etc. These applications may require database to show the data that the user requested. For example, you can think of a table that stores GPS-related data. The longitude ...
Jun 30, 20254 min read
[CS Fundamentals] Binary Search
Idea Binary Search is a powerful algorithm to search for a certain value. If you were to find 3 in an array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9], how are you going to come up with the index of 3? The first method that pops up in your head would be lookin...
May 19, 20253 min read
[CS Fundamentals] Sorting Algorithms
Selection Sort Selection sort is the simplest way to sort an array. Pretend that index 0 is the smallest, and we look at each element. We select the smallest element from other index and swap the two elements. array = [5, 7, 9, 0, 3, 1, 6, 2, 4, 8] ...
May 12, 20254 min read
[CS Fundamentals] DFS and BFS
In this article, I will introduce the basic concept of Depth-First Search(DFS) and Breadth-First Search(BFS). Both focuses searching, but the difference is the way of doing it. DFS To understand DFS, you need to know stack and recursive function. I ...
May 11, 20253 min read
[Python Debugging] Beautiful Soup Error - AttributeError: 'NoneType' object has no attribute 'text'
Error I was writing a code to crawl a website, and AttributeError: 'NoneType' object has no attribute 'text' occured. My Code: import requests from bs4 import BeautifulSoup param = { 'isDetailSearch': 'N', 'searchGubun': 'true', 'viewYn'...
Feb 8, 20252 min read
[Python] Global Interpreter Lock (GIL)
GIL GIL ensure that only one thread executes Python bytecode at a time, which means it prevents multiple threads from executing Python code concurrently. GIL works like this: There are three threads, but they are not running concurrently. One need...
Jan 30, 20251 min read