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CS50x 2025 - Lecture 3 - Algorithms

CS50Programming
13chapters with key takeaways — read first, then watch
1

Introduction to Algorithms and Efficiency

1:15-4:13•2m 58sIntro
2

Memory, Arrays, and Linear Search

4:14-12:55•8m 41sSetup
3

Binary Search and Sorted Data Requirement

12:56-17:52•4m 56sSetup
4

Asymptotic Notation: Big O, Omega, Theta

17:53-27:34•9m 41sSetup
5

Implementing Linear Search in C

27:35-37:32•9m 57sImplementation
6

Comparing Strings with strcmp in C

37:33-44:23•6m 50sImplementation
7

Custom Data Types: Structs for Phonebook

44:24-58:10•13m 46sSetup
8

Introduction to Sorting Algorithms

58:11-1:11:25•13m 14sIntro
9

Selection Sort: Mechanics and Efficiency

1:11:28-1:21:45•10m 17sImplementation
10

Bubble Sort: Mechanics and Optimization

1:21:46-1:31:58•10m 12sImplementation
11

Recursion: Concept and Pyramid Example

1:31:59-1:49:06•17m 7sSetup
12

Merge Sort: Algorithm and Merging Process

1:49:07-1:54:19•5m 12sImplementation
13

Merge Sort: Full Demo & Efficiency Analysis

1:54:20-2:06:35•12m 15sDemo

Video Details & AI Summary

Published Sep 23, 2024
Analyzed Jan 16, 2026

AI Analysis Summary

This CS50 lecture provides a comprehensive introduction to algorithms, focusing on searching and sorting. It covers linear and binary search, their C implementations, and the importance of data structures like structs. The lecture delves into algorithm efficiency using Big O, Omega, and Theta notations, and demonstrates various sorting algorithms including selection sort, bubble sort, and the more efficient merge sort, alongside an exploration of recursion.

Title Accuracy Score
10/10Excellent
38.4s processing
Model:gemini-2.5-flash

Original Video

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