This is Spring 2026 of CS50 (aka CSCI E-50) at Harvard Extension School.

This is CS50

Harvard Extension School
Spring 2026

CS50.ai
Ed Discussion
Gradescope
Visual Studio Code

Week 0 Scratch
Week 1 C
Week 2 Arrays
Week 3 Algorithms
Week 4 Memory
Week 5 Data Structures
Week 6 Python
Week 7 SQL
Week 8 HTML, CSS, JavaScript
Week 9 Flask
Week 10 Artificial Intelligence
Week 11 The End

Announcements
FAQs
Final Project
Office Hours
Problem Sets
Quizzes
Sections
Seminars
Staff
Syllabus
Test

CS50 Manual Pages
CS50 Status Page

Week 11 The End

Fun. Games.

Lecture
- Notes
- Slides
  - Google Slides
  - PDF
- Video
  - CS50 Video Player
  - YouTube