CS50x 2026 - Lecture 0 - Scratch

Description :

This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. In this first lecture, David Malan outlines the course structure and covers foundational topics such as artificial intelligence, unary and binary operations, ASCII, Unicode, color representation, algorithms, pseudocode, Scratch, and more. The lecture is organized into sections with the following timestamps: 00:00:00 - Introduction 00:02:03 - This is CS50 00:02:24 - Artificial Intelligence 00:14:12 - Computer Science 00:15:36 - Unary 00:16:06 - Binary 00:29:46 - ASCII 00:40:52 - Unicode 00:44:57 - Color 00:50:17 - Representation 00:55:23 - Algorithms 01:04:45 - Pseudocode 01:14:09 - Scratch 01:18:15 - Hello, World 01:21:21 - Hello, You 01:30:20 - Meow 01:33:51 - Abstractions 01:37:55 - Conditionals 01:40:05 - Oscartime 01:51:59 - Ivy’s Hardest Game