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Harvard University via YouTube Free video

CS50 Fall 2025 - Lecture 5 - Data Structures (live, unedited)

Overview

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This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming.

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TABLE OF CONTENTS

00:14:45 - Introduction

00:16:08 - Jack Learns the Facts

00:18:06 - Stacks and Queues

00:25:20 - Dictionaries

00:27:06 - Resizing Arrays

00:42:05 - realloc

00:48:38 - Linked Lists

01:53:09 - Trees

02:09:28 - Hashing and Hash Tables

02:24:44 - Tries

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HOW TO TAKE CS50

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Harvard Extension School: https://cs50.harvard.edu/extension

Harvard Summer School: https://cs50.harvard.edu/summer

OpenCourseWare: https://cs50.harvard.edu/x

HOW TO JOIN CS50 COMMUNITIES

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HOW TO FOLLOW DAVID J. MALAN

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CS50 SHOP

https://cs50.harvardshop.com/

***

LICENSE

CC BY-NC-SA 4.0

Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

https://creativecommons.org/licenses/by-nc-sa/4.0/

David J. Malan

https://cs.harvard.edu/malan

malan@harvard.edu

Chapters 10

  1. 00:14:45Introduction
  2. 00:16:08Jack Learns the Facts
  3. 00:18:06Stacks and Queues
  4. 00:25:20Dictionaries
  5. 00:27:06Resizing Arrays
  6. 00:42:05realloc
  7. 00:48:38Linked Lists
  8. 01:53:09Trees
  9. 02:09:28Hashing and Hash Tables
  10. 02:24:44Tries

Advantages and disadvantages

Advantages

  • One of the best-taught programming courses in the world, by David J. Malan and his team.
  • Problem sets are real projects that stay on your GitHub.
  • Free certificate from CS50 when you finish on cs50.harvard.edu (the edX certificate is paid).
  • Active community on Discord, Reddit and Ed for help at any hour.
  • Free, one long video that covers a topic end to end.
  • Use the chapters to jump to what you need.
  • Taught by Harvard University, one of the strongest names in its field.
  • Completely free.

Disadvantages

  • Problem sets are hard and take far longer than the videos; plan 10–20 hours a week.
  • Lectures are long (about 2 hours each).
  • No exercises or certificate: code along to make it stick.
  • No certificate.
  • No graded assignments or feedback.

Some points apply to every course of this kind; see how we rank.

Free

  • Free: Watch on YouTube, no account needed.
  • Certificate: None. Code or take notes along to make it stick.

Harvard University is in Tier 1: world-leading universities and India's top institutes of our institution ranking (98/100). CS50 and HarvardX are among the best-taught courses anywhere.

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