@hurricanebuzz
24 hours of Harvard Computer Science for free?! Huge respect 🙌
@HELLBORNE69
⌨ (00:00:00) Lecture 0 - Scratch ⌨ (02:05:47) Lecture 1 - C ⌨ (04:35:19) Lecture 2 - Arrays ⌨ (06:59:38) Lecture 3 - Algorithms ⌨ (09:01:13) Lecture 4 - Memory ⌨ (11:26:33) Lecture 5 - Data Structures ⌨ (13:42:44) Lecture 6 - Python ⌨ (15:58:02) Lecture 7 - SQL ⌨ (18:18:30) Lecture 8 - HTML, CSS, JavaScript ⌨ (20:58:14) Lecture 9 - Flask ⌨ (23:19:07) Lecture 10 - Emoji ⌨ (25:05:28) Cybersecurity
@alvsar2492
This teacher is a world class, no question on it
@StigPrice
Day one. I have learnt how to make my pc say meow three times and tidied up the code using a for loop. I paused the video and attmepted to write out the code before the lecturer gave the example and I got it right! Very proud of myself.
@dreamop823
Key Takeaways for quick navigation: 00:00 Introduction to the CS50 course and Dr. David Malan's background 07:12 Transition to the C programming language in Week One 18:09 Exploring Different Number Systems 24:29 Introducing Volunteers to Represent Bits 31:10 Bits and Bytes in Computer Memory 36:01 Decoding Text Messages Using ASCII 43:59 Representation of Emojis and Skin Tones in Unicode 46:04 Efficient Design in Unicode for Complex Emoji Representations 01:17:00 Scratch Interface and Basics 01:25:20 Exploring Scratch Features 01:39:04 Interactive Programming with Video Sensing Introduction to using Scratch for programming. Creating a program with synthesized speech. Explaining the concept of functions in programming. Implementing conditional behavior in Scratch. 01:53:18 Iterative Development in Scratch 01:57:46 Introduction to Programming Paradigm 02:03:54 More Complex Game Elements 02:08:11 Evaluating Code Quality 02:14:56 Structure of a Code Editor 02:25:12 Transition from Scratch to C 03:02:01 Simplifying Conditional Logic 03:07:08 Exploring the structure of C code.* 03:09:30 Handling multiple conditions using "else if."* 03:10:28 Handling a catch-all condition.* 03:11:36 Recap and review of C code.* 03:14:09 Code optimization by eliminating redundancy.* 03:14:25 Recap of coding concepts.* 03:14:34 Addressing questions and clarifications.* 03:50:56 Break and Introduction to Mario ASCII Art 03:53:54 Printing a Column of Bricks 03:55:18 Printing a 3x3 Grid of Bricks 03:56:01 Discussing the idea of printing rows of bricks in a grid format. 04:14:29 Creating Functions with Inputs 04:49:23 Troubleshooting an error with get_string function, 05:21:57 Debugging with Breakpoints 05:22:25 Debugging in CS50, 05:26:46 Rubber Duck Debugging, 05:55:23 Introduction to arrays and for loops 06:15:15 Manipulating Strings in C 06:30:50 Introduction to converting characters to uppercase in C 06:35:12 Leveraging the ctype.h library for character manipulation 06:42:34 Command-line arguments in C programs 06:48:22 More fun with command-line arguments: Changing the "cow" to a "duck" 06:49:21 Exit Status and Error Codes 06:50:29 The Role of "int" in "main" 07:24 Understanding Algorithm Efficiency 07:41:42 Introduction to creating a phone book in C 07:43:33 Introducing the concept of a custom data type 07:59:00 Sorting Algorithms Introduction 08:08:00 Bubble Sort 08:18:10 Bubble Sort Analysis 08:27:04 Recursion and Recursive Functions 08:57:04 Time Complexity of Merge Sort 09:07:51 Introduction to Hexadecimal and Base 16 09:10:19 Understanding Hexadecimal Representation 09:19:54 Getting the Address of a Variable 09:44:01 Introduction to Data Types and Strings in C 10:03:55 Harnessing Pointer Arithmetic with Strings 10:17:37 Exploring string manipulation 10:19:27 Copying strings and memory allocation 10:47:25 Handling Garbage Values 11:09:12 Swapping values using pointers in C, 11:13:00 Memory limitations and potential issues in C, 11:27:18 Importance of Data Structures 12:24:03 Adding Elements to Linked List 12:34:00 Explanation of implementing a stack using linked lists, 12:44:00 Iterating over the linked list, 12:51:00 In this section, the main focus is on understanding the running time of various operations in linked lists. 12:56:00 This section introduces the concept of binary search trees (BSTs) as a way to achieve both binary search and dynamism. 13:12:24 Balanced binary search trees and algorithm complexity 13:18:06 Hashing and hash functions 13:24:38 Understanding Hash Tables and Memory Usage 13:41:41 Introduction to Python 13:56:53 Data Types in Python 13:59:54 Implementing Spell Checker in Python 14:11:12 Face Recognition in Python 14:19:13 Variable manipulation and loops in Python 14:26:53 No need for a main function in Python 14:33:41 Integer overflow and big numbers in Python 15:11:18 Python Printing Techniques 15:26:12 Python: Accessing Command Line Arguments 15:41:10 Introduction to Python Dictionaries and Their Use Cases 15:43:28 Swapping Values in Python 15:47:12 Working with CSV Files in Python 15:54:27 Text-to-Speech Synthesis in Python 15:57:36 Conclusion and Introduction to SQL 16:19:33 Improved Language Counting 16:26:29 Sorting Data 16:30:13 Interactive User Input 16:34:40 Introduction to Relational Databases 16:36:06 Basic SQL Operations 16:51:30 Introduction to SQL in Python 17:08:10 Database Design Considerations 17:11:42 Primary Keys and Foreign Keys 17:26:27 Querying Relationships 17:32:59 Joining Multiple Tables 17:43:37 Fuzzy Matching in SQL 17:45:03 Creating a database index for faster searches 18:01:29 Introduction to the use of placeholders in SQL queries 18:05:13 Preventing SQL injection attacks 18:22:31 Understanding the Basics of TCP/IP 18:44:25 HTTP as an Application-Level Protocol 18:54:06 Viewing HTTP Request Headers 19:05:27 Prank at Harvard-Yale Football Game 19:10:45 Introduction to HTML and Web Technologies 19:14:39 Running a Web Server with http-server 19:15:36 Accessing the Hosted Website 19:16:46 Understanding URL Structure 19:17:39 HTML Tag Hierarchy 19:21:48 HTML Elements and Hierarchy 19:31:07 Introduction to HTML Tags 19:32:29 Creating Lists in HTML 19:47:43 HTML Meta Tags 20:22:12 Introduction to JavaScript 20:23:35 JavaScript Variables 20:25:14 JavaScript in Web Development 20:25:56 Client-Side JavaScript 20:27:07 HTML Form Creation 20:29:56 Optimizing JavaScript Code 20:45:47 Dynamic table sorting with JavaScript 20:49:10 Changing background color with JavaScript 21:02:19 Folder Structure for Web Applications 21:17:15 Handling user input via URL parameters: 21:35 Using Templates and Layouts 21:48 Flask Web Development Basics 22:03 Template Layouts in Flask 22:07:18 Storing user registration data in a dictionary 22:10:18 Displaying user registrations on a webpage 22:34:55 Displaying Registered Users 23:36:23 Overview of Computer Science Course 23:51:38 Preparing for Post-CS50 23:55:51 Introduction to Review Session 23:56:19 Python "Hello World" Question 23:57:05 DNS (Domain Name System) Question 23:58:00 Merge Sort Runtime Question 23:59:08 ARG C in C Programming Question 24:00:19 File Opening Function in C Question 24:08:45 Valid Way to Print Exclamation Point Question 24:10:23 Compiling Steps Question 24:11:02 Surprise at the Beginning of the Halloween Lecture Question 24:13:20 Unicode and Emoji Introduction 24:14:28 Representation of Japanese Foods in Emoji 24:16:06 Universal Appeal of Dumplings Discussion 24:17:00 Introduction to Jennifer 8 Lee's Talk 24:20:33 Evolution of Emoji Discussion 24:22:13 Unicode Consortium and Emoji 24:25:20 Representation of Food in Emoji 24:27:17 Importance of Inclusivity in Emoji 24:37:32 Introduction to the Next Section 24:39:20 Memory Hierarchy 24:40:25 Storage Devices 24:41:31 CPU Clock Speed 24:45:15 System Architecture Quiz 24:48:33 Algorithm Efficiency 24:56:00 Recommended Books 24:57:52 Farewell and Good Luck 23:58:00 Merge Sort Algorithm Analysis 24:00:19 The Duck Debugger 24:03:00 How Strings Length is Computed in C 24:10:09 Arrow Operator in C 24:12:54 Missing Dumpling Emoji 24:16:21 Involvement with Unicode Consortium 24:29:02 Encoding Characters and Code Points 24:33:07 Depiction of Race and Nationality in Emoji 24:33:35 Evolution of Emoji Design 24:36:30 Contributions to Emoji 24:53:46 Emoji Directionality 24:55:36 Future of Emojis 25:03:07 Course Conclusion 25:09:54 Password Choices 25:10:23 Password Security 25:12:26 Cracking a 4-Digit Passcode 25:28:22 Lockout Mechanism
@realbenedictik
This harvard lecturer has so much passion impacting knowledge. 20 mins in and I've learnt quite a lot.
@jemgodspeed
I’m “learning” programming by myself. Having someone explain it like this make it so much easier
@MC75448
The light bulbs on the edge of the stage spell a different word in binary for each class. I've never loved a class more. David makes learning effortless.
@JDP_93
Got laid off of my construction job after working 50-60 hours a week faithfully. Now I’m going to lock down for the next year and learn the basics of coding to ultimately get a tech job. Today is day 1. Let’s go 🙏🏾
@richardmasters2045
I’m crying right now because I was denied a college education after being shot and disabled and was not able to afford to get the education of such caliber. David is an amazing professor and I am grateful to be able to watch this awesome CS50 course.
@thelife5628
5:00:11 Compiling converts C code into assembly code. 5:01:53 AMD CPUs understand Assembly Language for efficient code execution 5:05:45 The code is stored on a virtual hard drive in the cloud. 5:07:54 The purpose of a library is to make it easier to use and reuse code that's already been written. 5:11:53 Code compiled into zeros and ones is not necessarily predictable, making decompiling challenging. 5:13:34 Debugging code is a lifelong skill and there are tools and techniques available to make it easier. 5:16:57 Debugging using printf statements 5:18:42 Using printf as a diagnostic tool in programming 5:22:09 Using breakpoints in debug mode to step through code 5:23:56 The debugger in CS50 shows variables and allows stepping through code 5:27:18 Using a panel to display changing values instead of print statement 5:29:07 The cs50 library prompts the user for a negative integer and stores the value in n. 5:32:52 Exploring the behavior of a 'do-while' loop in the program. 5:34:38 Using a debugger can help in finding bugs in code 5:38:11 Data types represent different types of data with a specific number of bits allocated to them. 5:39:58 Data in computers is represented using bits and bytes. 5:43:27 Memory in a computer is like a canvas for storing information in units of bytes or 8 bits. 5:45:11 Computing the average of three values using C 5:48:42 The video discusses the concept of memory and storing data. 5:50:33 Declare an array in C to store three integer values 5:54:26 Using loops to avoid repetitive code and improve code design. 5:56:21 Memory in computers is contiguous, and arrays can be passed as arguments in code. 5:59:58 Declare a constant variable to avoid hardcoding and easily reuse values. 6:02:01 Taking the average of a variable number of scores using a loop. 6:06:01 In C, you must remember the length of an array yourself. 6:07:58 In C, you cannot determine the size of an array when it is passed into a function. 6:11:31 A string is just an array of characters in memory. 6:13:24 Strings in memory take up one more byte than the characters typed by the programmer 6:17:12 Understanding operations on strings in computer science. 6:19:12 Strings in C are treated differently and have special implementations 6:22:59 Manipulating strings in arrays using new syntax 6:25:11 Calculate the length of a string in C 6:28:54 Introduce string manipulation and library functions in C 6:30:56 Iterate through each character in a given string, check if it is lowercase, and convert it to uppercase. 6:34:53 Using libraries in programming to solve common problems efficiently 6:36:42 Implement a program that's correct but better designed with fewer lines of code and lower probability of mistakes. 6:40:40 Introducing command-line arguments in the program 6:42:40 argc stands for argument count and is used to determine the length of the array of words typed at the prompt. 6:46:44 Command line arguments are used to modify the behavior of a program. 6:48:34 Command line arguments and exit status in coding 6:52:22 You can use the command 'Echo $?' to see the exit status of your program. 6:54:17 Cryptography is the art and science of encrypting information. 6:57:50 Encryption and decryption process explained 7:01:19 Efficiency of algorithms and its impact on solving problems 7:04:40 Searching algorithms and memory storage in computers 7:06:20 Executing the linear search algorithm to find the hidden 50 in the lockers 7:10:26 Using bracket notation, Jackson can treat the set of lockers as an array 7:12:06 Using binary search algorithm to find a number in an array 7:15:44 Divide and conquer approach for searching in an array 7:17:30 Binary search is more efficient than linear search 7:20:54 Algorithms perform similarly for large input sizes 7:22:39 Linear search has a time complexity of O(n) and binary search has a time complexity of O(log n). 7:26:21 Big O, Omega, and Theta allow computer scientists to analyze algorithm efficiency. 7:28:04 Translate the discussed ideas to actual code using arrays 7:31:50 Implementation of linear search in C using an array of numbers. 7:33:44 String comparison in C requires using a function called strcmp instead of == operator. 7:37:50 Avoid touching memory that shouldn't be accessed 7:39:40 Returning zero in main signifies code execution is successful 7:43:25 Using a 2D array to store names and numbers is a cleaner approach than combining them into the same array. 7:45:20 Code successfully searches for phone numbers in a phone book. 7:49:16 Defining a new data type called person using struct keyword 7:51:08 Creating a structure to store person's information 7:54:51 Read and update information dynamically from a file 7:56:50 C cannot set default values in struct, unlike more modern languages like Python and Java. 8:00:49 Sorting volunteers using selection sort algorithm 8:02:34 Using selection sort to sort a list of numbers 8:05:56 Bubble sort is a different approach to sorting that focuses on smaller problems. 8:07:34 Bubble sort algorithm to solve sorting problems 8:11:25 Counting the number of comparisons is a global unit of measure to analyze algorithms. 8:13:14 Number of comparisons to find the smallest element decreases by 1 for each iteration. 8:16:57 Selection sort takes N^2 steps in worst case and N^2 steps in best case 8:18:52 Iterate through the array from 0 to n minus 2 to avoid going beyond array boundaries. 8:22:30 Bubble sort has a short-circuit detail helpful for already sorted data 8:24:27 Sorting algorithms like selection sort and bubble sort have a redundant comparison process that results in slow performance for large numbers 8:28:14 Recursion allows calling a function on a smaller version of the problem until no more problems to solve. 8:30:05 Recursive search algorithm for a phone book 8:33:52 Implementing a pyramid drawing function using recursion. 8:35:49 Creating a pyramid recursively 8:39:33 The base case is important to prevent the code from running forever. 8:41:20 Recursion can be used with return values. 8:45:07 Merging two sorted halves 8:46:51 Merge sort requires additional memory for implementation 8:50:24 Sorting the left half and right half of the original input separately 8:52:19 Merging and sorting the left and right halves of the given list 8:56:09 The running time of merge sort is O(n log n) and it is better than bubble sort and selection sort. 8:57:56 Merge sort is generally preferred for sorting as it is faster. 9:03:45 Understanding computer memory helps in representing and creating interesting things 9:05:26 RGB color system: Red, Green, Blue 9:08:59 Hexadecimal is a base-16 system used to represent numbers beyond 0-9. 9:10:53 Heximal (hexadecimal) is a number system that uses 16 symbols to count. It is useful for various applications. 9:14:48 Hexadecimal is a base system used in computers to represent information. 9:16:35 Hexadecimal is commonly used to describe memory locations in computer systems and software. 9:20:11 Conceptually, the programmer knows that the number 50 is assigned to the symbol n in the computer's memory. 9:21:51 C language has operators to get the address of a variable and go to a specific address in memory. 9:25:30 A pointer is a variable that contains the address of a value. 9:27:23 The video explains the concept of pointers in C programming. 9:30:59 The code assigns the value of 'n' to variable 'p' using the address of 'n'. 9:32:42 Pointers are variables that point to something else 9:36:19 Arrays and pointers have a relationship, but are technically different. 9:38:07 Strings in programming are special as they store multiple characters and have a null character at the end. 9:41:42 String in C is actually a Char star 9:43:30 Defining data types in C using type def 9:47:13 Pointers in C are declared using the star symbol and can be dereferenced using the star symbol. 9:49:00 Printing the address of a string using the %p format specifier 9:52:40 The 'percent s' is used in printf to print the characters in a string. 9:54:39 The video discusses the concept of addresses in C programming. 9:58:19 Printing characters from a string using pointers
@phhistoryenthusiast6461
63 years old from the Philippines learning to code
@sidhu704
I graduated from my undergrad in CS at a uni in the UK back in 2019, decided to watch this since my field of work briefly shifted post uni, but now coming back to software dev thought about checking this out, I'm only 2 hours into this course and it's already miles and miles better than what I went through on my course, almost feels like I wasted money, there were useful bits ofc, but this is just highly engaging and so well structured. So glad this is available for free!!!!
@IanNubbit
The first 40 minutes have answered so many random questions I’ve asked over the years but never truly answered. Ill probably watch this over and over again
@AnshParmar1
for me 10:00:08 Pointer arithmetic allows performing operations on pointers to manipulate memory addresses. 10:03:24 The power and danger of C programming and solving various segfault errors 10:05:08 Printing substrings of a string using printf 10:08:45 The program compares two strings and determines if they are the same or different. 10:10:30 Comparing strings in C involves comparing the memory addresses 10:14:06 String comparison in programming is special and treated differently from other data types. 10:16:13 Explains the concept of address and how it is used in comparing characters of strings. 10:19:55 Line 12 capitalizes the first letter of T 10:21:48 Python and other languages have benefits 10:25:30 Managing memory using malloc and free 10:27:05 Copying a string to another variable using pointers and memory allocation. 10:30:47 Iterating over and copying the characters in a string. 10:32:48 Avoid calling a function repeatedly inside your condition in a loop. 10:36:31 Use null to signal errors in coding 10:38:13 Always free memory allocated using malloc 10:41:46 Introducing the program valgrind to find memory errors in code execution 10:43:33 Bug in memory allocation and writing 10:47:07 Not initializing values in an array in C can lead to unpredictable output. 10:48:50 Garbage values in computer memory can cause errors in programs. 10:52:19 Understanding pointers and how they work 10:54:21 Manipulating memory with pointers. 10:58:09 Swapping two values using a temporary variable 10:59:51 Passing arguments by value in C does not allow swapping of values 11:03:25 Memory management in computer programs 11:05:07 Understanding memory allocation and deallocation in programs. 11:08:37 You can change the value of a variable by following memory addresses and swapping the values. 11:10:14 Passing addresses instead of integers for swap function 11:13:46 Buffer overflows can occur due to logical bugs in code 11:15:28 scanf can change the value of X by reference using Ampersand 11:19:08 Not initializing a pointer can lead to reading/writing into garbage memory locations. 11:20:59 Handling variable length inputs in C programming. 11:24:09 Introduction to reading and writing files in C 11:27:11 This week we will focus on data structures and abstract data types. 11:31:08 FIFO and LIFO are two different ways of adding and removing items from a queue or stack. 11:32:47 Storing emails and sweaters using a stack 11:36:29 The main limitation of this design is that it can only hold a finite number of items. 11:38:16 Jack learns to use a queue to manage his clothes 11:41:49 Moving a string to a new chunk of memory to add a number 11:43:27 Growing the array in this way can lead to inefficiency 11:47:07 Allocating memory dynamically for an array in C programming. 11:48:53 Using a pointer instead of an array for a list increases dynamism. 11:52:40 Copying bytes from old array to new array, allocating and freeing memory in C programming 11:54:31 Implementing inefficient allocation and population of a new array with a fourth value. 11:58:35 The function realloc simplifies the process of reallocating memory in C. 12:00:30 The use of realloc in C allows for dynamic memory allocation and copying without the need for explicit for loops. 12:04:32 Arrays and memory manipulation in computer science 12:06:20 Struct in C allows us to create our own structure in memory. 12:09:50 Creating a linked list with random memory positions 12:11:47 Use a sentinel value as a special signal for an invalid address 12:15:35 To enable backward traversal in a linked list, we can use a doubly linked list or make the list circular. 12:17:25 Using pointers in C to create self-referential structures 12:21:11 Using linked lists in place of arrays increases memory usage and eliminates the ability to index elements. 12:22:54 Binary search algorithm cannot be used when the data is not sequentially stored in memory. 12:26:10 Executing the provided code assigns a valid pointer to variable n. 12:27:53 Syntax for dereferencing a pointer and accessing a structure using arrow notation 12:31:22 Memory leak due to orphaned node 12:33:17 Implementing a stack using a linked list 12:36:52 Implementing a linked list of size zero and taking command line arguments 12:38:51 Converting command line arguments to integers using atoi. 12:42:28 Printing each number in a linked list 12:44:14 Iterating over a linked list using pointers and the null value 12:48:06 To avoid segmentation faults, use a temporary pointer for swapping and freeing memory. 12:49:54 Understanding the usage of while loops and for loops in iterating over nodes in a linked list. 12:53:23 Appending values at the end of a linked list increases the running time to O(n). 12:55:02 Maintaining a sorted list in a linked list 12:58:31 Binary search trees are structured like family trees and have special properties for binary search. 13:00:24 Using a two-dimensional approach for array layout and introducing nodes and pointers to connect them 13:03:56 Implementing binary search using a two-dimensional structure 13:05:45 Recursion is a beautiful technique for dealing with two-dimensional structures. 13:09:21 Not necessary to have pointers in both directions, but it can improve efficiency. 13:11:10 Implementing a binary search tree without balancing can result in an unbalanced tree with a height of N instead of log base 2 of N 13:14:39 Hashing is a final building block to achieve constant time lookup. 13:16:26 Sorting a deck of cards using bucketization and hashing. 13:20:16 Using linked lists improves the efficiency of contact lookup in a contact card representation 13:22:07 Hash tables offer efficient search time in constant time 13:25:49 Representation of nodes in the tree 13:27:35 Hash tables allow for constant time indexing and searching. 13:31:32 Tries are a data structure that combines aspects of arrays and hash tables. 13:33:21 Finding someone in a trie data structure takes a constant number of steps, regardless of the number of names in the data structure. 13:36:58 The try data structure is used to efficiently store and retrieve data. 13:39:00 Data structures are everywhere in the real world 13:44:03 Transition from Scratch to Python 13:45:46 Python eliminates the need for compiling code and allows program to be interpreted directly 13:49:05 Running python hello.py will print 'hello world' on the terminal. 13:50:50 In Python, the syntax for declaring variables and printing has changed compared to C. 13:54:22 Python supports format strings or F strings for automatic value substitution. 13:56:16 Python printing with curly braces 13:59:52 Implementing a spell checker in Python instead of C 14:01:38 Using a set in Python can be used as a dictionary for spellchecking words. 14:05:15 The C version of spell checker compiled faster than the Python version. 14:07:10 Using a more modern and user-friendly language like Python comes with a trade-off of potential performance loss. 14:10:46 Face recognition software can analyze and detect multiple faces, but can be trained to recognize specific faces. 14:12:44 Software can identify a human face by analyzing patterns of pixels. 14:16:21 Python has simplified the syntax for conditionals and introduced the 'elif' keyword 14:18:07 In Python, you can create a variable and set its initial value without specifying the type or using a semicolon. 14:21:33 Using the range function in Python is more efficient than hardcoding a list of numbers. 14:23:16 Infinite loops can be implemented using a 'while true' statement in C and a 'while True' statement in Python. 14:26:49 The default indentation in a Python file is left indented, and code is executed top to bottom, left to right 14:28:44 Python has a built-in function called 'int' to convert a string to an integer. 14:32:35 Python has solutions for floating point precision issues and integer overflow 14:34:31 Comparing values in C and Python 14:38:26 Explaining the usage of single quotes and double quotes in Python 14:40:17 In Python, you can use the 'in' keyword to search a list and it will return True if the value is found and False if not. 14:44:12 Python strings have built-in methods that can modify their values. 14:46:16 Strings in Python are immutable and cannot be changed directly 14:49:51 Implementing functions in Python using the 'def' keyword 14:51:34 Troubleshooting Python name errors 14:55:15 Code execution order in Python 14:57:04 Introducing Python's functionality to print a vertical column of bricks in the Mario game
@Retro_Sapien
Really shows how important it is to have good lecturers for learning. Whoever made the subtitles deserves love and support.
@yovanicastro7949
00:00 Introduction to the CS50 course and Dr. David Malan's background 07:12 Transition to the C programming language in Week One 18:09 Exploring Different Number Systems 24:29 Introducing Volunteers to Represent Bits 31:10 Bits and Bytes in Computer Memory 36:01 Decoding Text Messages Using ASCII 43:59 Representation of Emojis and Skin Tones in Unicode 46:04 Efficient Design in Unicode for Complex Emoji Representations 01:17:00 Scratch Interface and Basics 01:25:20 Exploring Scratch Features 01:39:04 Interactive Programming with Video Sensing Introduction to using Scratch for programming. Creating a program with synthesized speech. Explaining the concept of functions in programming. Implementing conditional behavior in Scratch. 01:53:18 Iterative Development in Scratch 01:57:46 Introduction to Programming Paradigm 02:03:54 More Complex Game Elements 02:08:11 Evaluating Code Quality 02:14:56 Structure of a Code Editor 02:25:12 Transition from Scratch to C 03:02:01 Simplifying Conditional Logic 03:07:08 Exploring the structure of C code.* 03:09:30 Handling multiple conditions using "else if."* 03:10:28 Handling a catch-all condition.* 03:11:36 Recap and review of C code.* 03:14:09 Code optimization by eliminating redundancy.* 03:14:25 Recap of coding concepts.* 03:14:34 Addressing questions and clarifications.* 03:50:56 Break and Introduction to Mario ASCII Art 03:53:54 Printing a Column of Bricks 03:55:18 Printing a 3x3 Grid of Bricks 03:56:01 Discussing the idea of printing rows of bricks in a grid format. 04:14:29 Creating Functions with Inputs 04:49:23 Troubleshooting an error with get_string function, 05:21:57 Debugging with Breakpoints 05:22:25 Debugging in CS50, 05:26:46 Rubber Duck Debugging, 05:55:23 Introduction to arrays and for loops 06:15:15 Manipulating Strings in C 06:30:50 Introduction to converting characters to uppercase in C 06:35:12 Leveraging the ctype.h library for character manipulation 06:42:34 Command-line arguments in C programs 06:48:22 More fun with command-line arguments: Changing the "cow" to a "duck" 06:49:21 Exit Status and Error Codes 06:50:29 The Role of "int" in "main" 07:24 Understanding Algorithm Efficiency 07:41:42 Introduction to creating a phone book in C 07:43:33 Introducing the concept of a custom data type 07:59:00 Sorting Algorithms Introduction 08:08:00 Bubble Sort 08:18:10 Bubble Sort Analysis 08:27:04 Recursion and Recursive Functions 08:57:04 Time Complexity of Merge Sort 09:07:51 Introduction to Hexadecimal and Base 16 09:10:19 Understanding Hexadecimal Representation 09:19:54 Getting the Address of a Variable 09:44:01 Introduction to Data Types and Strings in C 10:03:55 Harnessing Pointer Arithmetic with Strings 10:17:37 Exploring string manipulation 10:19:27 Copying strings and memory allocation 10:47:25 Handling Garbage Values 11:09:12 Swapping values using pointers in C, 11:13:00 Memory limitations and potential issues in C, 11:27:18 Importance of Data Structures 12:24:03 Adding Elements to Linked List 12:34:00 Explanation of implementing a stack using linked lists, 12:44:00 Iterating over the linked list, 12:51:00 In this section, the main focus is on understanding the running time of various operations in linked lists. 12:56:00 This section introduces the concept of binary search trees (BSTs) as a way to achieve both binary search and dynamism. 13:12:24 Balanced binary search trees and algorithm complexity 13:18:06 Hashing and hash functions 13:24:38 Understanding Hash Tables and Memory Usage 13:41:41 Introduction to Python 13:56:53 Data Types in Python 13:59:54 Implementing Spell Checker in Python 14:11:12 Face Recognition in Python 14:19:13 Variable manipulation and loops in Python 14:26:53 No need for a main function in Python 14:33:41 Integer overflow and big numbers in Python 15:11:18 Python Printing Techniques 15:26:12 Python: Accessing Command Line Arguments 15:41:10 Introduction to Python Dictionaries and Their Use Cases 15:43:28 Swapping Values in Python 15:47:12 Working with CSV Files in Python 15:54:27 Text-to-Speech Synthesis in Python 15:57:36 Conclusion and Introduction to SQL 16:19:33 Improved Language Counting 16:26:29 Sorting Data 16:30:13 Interactive User Input 16:34:40 Introduction to Relational Databases 16:36:06 Basic SQL Operations 16:51:30 Introduction to SQL in Python 17:08:10 Database Design Considerations 17:11:42 Primary Keys and Foreign Keys 17:26:27 Querying Relationships 17:32:59 Joining Multiple Tables 17:43:37 Fuzzy Matching in SQL 17:45:03 Creating a database index for faster searches 18:01:29 Introduction to the use of placeholders in SQL queries 18:05:13 Preventing SQL injection attacks 18:22:31 Understanding the Basics of TCP/IP 18:44:25 HTTP as an Application-Level Protocol 18:54:06 Viewing HTTP Request Headers 19:05:27 Prank at Harvard-Yale Football Game 19:10:45 Introduction to HTML and Web Technologies 19:14:39 Running a Web Server with http-server 19:15:36 Accessing the Hosted Website 19:16:46 Understanding URL Structure 19:17:39 HTML Tag Hierarchy 19:21:48 HTML Elements and Hierarchy 19:31:07 Introduction to HTML Tags 19:32:29 Creating Lists in HTML 19:47:43 HTML Meta Tags 20:22:12 Introduction to JavaScript 20:23:35 JavaScript Variables 20:25:14 JavaScript in Web Development 20:25:56 Client-Side JavaScript 20:27:07 HTML Form Creation 20:29:56 Optimizing JavaScript Code 20:45:47 Dynamic table sorting with JavaScript 20:49:10 Changing background color with JavaScript 21:02:19 Folder Structure for Web Applications 21:17:15 Handling user input via URL parameters: 21:35 Using Templates and Layouts 21:48 Flask Web Development Basics 22:03 Template Layouts in Flask 22:07:18 Storing user registration data in a dictionary 22:10:18 Displaying user registrations on a webpage 22:34:55 Displaying Registered Users 23:36:23 Overview of Computer Science Course 23:51:38 Preparing for Post-CS50 23:55:51 Introduction to Review Session 23:56:19 Python "Hello World" Question 23:57:05 DNS (Domain Name System) Question 23:58:00 Merge Sort Runtime Question 23:59:08 ARG C in C Programming Question 24:00:19 File Opening Function in C Question 24:08:45 Valid Way to Print Exclamation Point Question 24:10:23 Compiling Steps Question 24:11:02 Surprise at the Beginning of the Halloween Lecture Question 24:13:20 Unicode and Emoji Introduction 24:14:28 Representation of Japanese Foods in Emoji 24:16:06 Universal Appeal of Dumplings Discussion 24:17:00 Introduction to Jennifer 8 Lee's Talk 24:20:33 Evolution of Emoji Discussion 24:22:13 Unicode Consortium and Emoji 24:25:20 Representation of Food in Emoji 24:27:17 Importance of Inclusivity in Emoji 24:37:32 Introduction to the Next Section 24:39:20 Memory Hierarchy 24:40:25 Storage Devices 24:41:31 CPU Clock Speed 24:45:15 System Architecture Quiz 24:48:33 Algorithm Efficiency 24:56:00 Recommended Books 24:57:52 Farewell and Good Luck 23:58:00 Merge Sort Algorithm Analysis 24:00:19 The Duck Debugger 24:03:00 How Strings Length is Computed in C 24:10:09 Arrow Operator in C 24:12:54 Missing Dumpling Emoji 24:16:21 Involvement with Unicode Consortium 24:29:02 Encoding Characters and Code Points 24:33:07 Depiction of Race and Nationality in Emoji 24:33:35 Evolution of Emoji Design 24:36:30 Contributions to Emoji 24:53:46 Emoji Directionality 24:55:36 Future of Emojis 25:03:07 Course Conclusion 25:09:54 Password Choices 25:10:23 Password Security 25:12:26 Cracking a 4-Digit Passcode 25:28:22 Lockout Mechanism
@jaimediez
🎯 Key Takeaways for quick navigation: 00:00 🎓 Introduction to the CS50 course and Dr. David Malan's background 07:12 🛠️ Transition to the C programming language in Week One 18:09 🧮 Exploring Different Number Systems 24:29 🔢 Introducing Volunteers to Represent Bits 31:10 🖥️ Bits and Bytes in Computer Memory 36:01 📱 Decoding Text Messages Using ASCII 43:59 🎨 Representation of Emojis and Skin Tones in Unicode 46:04 🖌️ Efficient Design in Unicode for Complex Emoji Representations 01:17:00 🧰 Scratch Interface and Basics 01:25:20 🎉 Exploring Scratch Features 01:39:04 📹 Interactive Programming with Video Sensing Introduction to using Scratch for programming. Creating a program with synthesized speech. Explaining the concept of functions in programming. Implementing conditional behavior in Scratch. 01:53:18 🔄 Iterative Development in Scratch 01:57:46 🎮 Introduction to Programming Paradigm 02:03:54 🧩 More Complex Game Elements 02:08:11 📊 Evaluating Code Quality 02:14:56 📄 Structure of a Code Editor 02:25:12 🔄 Transition from Scratch to C 03:02:01 🤖 Simplifying Conditional Logic 03:07:08 🧮 Exploring the structure of C code.* 03:09:30 🔄 Handling multiple conditions using "else if."* 03:10:28 🗃️ Handling a catch-all condition.* 03:11:36 🧩 Recap and review of C code.* 03:14:09 🔂 Code optimization by eliminating redundancy.* 03:14:25 🎯 Recap of coding concepts.* 03:14:34 🤔 Addressing questions and clarifications.* 03:50:56 🍪 Break and Introduction to Mario ASCII Art 03:53:54 🧱 Printing a Column of Bricks 03:55:18 🧱🧱🧱 Printing a 3x3 Grid of Bricks 03:56:01 🧱 Discussing the idea of printing rows of bricks in a grid format. 04:14:29 💡 Creating Functions with Inputs 04:49:23 🛠️ Troubleshooting an error with get_string function, 05:21:57 🐞 Debugging with Breakpoints 05:22:25 🐞 Debugging in CS50, 05:26:46 🦆 Rubber Duck Debugging, 05:55:23 🧠 Introduction to arrays and for loops 06:15:15 🖥️ Manipulating Strings in C 06:30:50 🐍 Introduction to converting characters to uppercase in C 06:35:12 📚 Leveraging the ctype.h library for character manipulation 06:42:34 🚀 Command-line arguments in C programs 06:48:22 🦆 More fun with command-line arguments: Changing the "cow" to a "duck" 06:49:21 🚀 Exit Status and Error Codes 06:50:29 🔍 The Role of "int" in "main" 07:24 🕒 Understanding Algorithm Efficiency 07:41:42 📚 Introduction to creating a phone book in C 07:43:33 🧮 Introducing the concept of a custom data type 07:59:00 🧐 Sorting Algorithms Introduction 08:08:00 🧼 Bubble Sort 08:18:10 🔄 Bubble Sort Analysis 08:27:04 ♻️ Recursion and Recursive Functions 08:57:04 🕰️ Time Complexity of Merge Sort 09:07:51 🧮 Introduction to Hexadecimal and Base 16 09:10:19 💡 Understanding Hexadecimal Representation 09:19:54 💡 Getting the Address of a Variable 09:44:01 🔍 Introduction to Data Types and Strings in C 10:03:55 💡 Harnessing Pointer Arithmetic with Strings 10:17:37 🧮 Exploring string manipulation 10:19:27 📝 Copying strings and memory allocation 10:47:25 💡 Handling Garbage Values 11:09:12 🔄 Swapping values using pointers in C, 11:13:00 🚫 Memory limitations and potential issues in C, 11:27:18 🧮 Importance of Data Structures 12:24:03 📜 Adding Elements to Linked List 12:34:00 📚 Explanation of implementing a stack using linked lists, 12:44:00 🔄 Iterating over the linked list, 12:51:00 🔗 In this section, the main focus is on understanding the running time of various operations in linked lists. 12:56:00 🌲 This section introduces the concept of binary search trees (BSTs) as a way to achieve both binary search and dynamism. 13:12:24 🌲 Balanced binary search trees and algorithm complexity 13:18:06 ⚖️ Hashing and hash functions 13:24:38 🧮 Understanding Hash Tables and Memory Usage 13:41:41 📚 Introduction to Python 13:56:53 📊 Data Types in Python 13:59:54 🖥️ Implementing Spell Checker in Python 14:11:12 🧑💻 Face Recognition in Python 14:19:13 🧮 Variable manipulation and loops in Python 14:26:53 🔄 No need for a main function in Python 14:33:41 🐍 Integer overflow and big numbers in Python 15:11:18 🖋️ Python Printing Techniques 15:26:12 🖥️ Python: Accessing Command Line Arguments 15:41:10 📚 Introduction to Python Dictionaries and Their Use Cases 15:43:28 🔄 Swapping Values in Python 15:47:12 📁 Working with CSV Files in Python 15:54:27 🔊 Text-to-Speech Synthesis in Python 15:57:36 🎓 Conclusion and Introduction to SQL 16:19:33 📊 Improved Language Counting 16:26:29 📈 Sorting Data 16:30:13 🔄 Interactive User Input 16:34:40 📊 Introduction to Relational Databases 16:36:06 🗃️ Basic SQL Operations 16:51:30 💼 Introduction to SQL in Python 17:08:10 🧩 Database Design Considerations 17:11:42 🔑 Primary Keys and Foreign Keys 17:26:27 📚 Querying Relationships 17:32:59 🌐 Joining Multiple Tables 17:43:37 🕵️ Fuzzy Matching in SQL 17:45:03 📈 Creating a database index for faster searches 18:01:29 🤖 Introduction to the use of placeholders in SQL queries 18:05:13 💼 Preventing SQL injection attacks 18:22:31 🌐 Understanding the Basics of TCP/IP 18:44:25 🌐 HTTP as an Application-Level Protocol 18:54:06 📨 Viewing HTTP Request Headers 19:05:27 🎉 Prank at Harvard-Yale Football Game 19:10:45 🌐 Introduction to HTML and Web Technologies 19:14:39 🖥️ Running a Web Server with http-server 19:15:36 🌐 Accessing the Hosted Website 19:16:46 🌐 Understanding URL Structure 19:17:39 🌐 HTML Tag Hierarchy 19:21:48 🌐 HTML Elements and Hierarchy 19:31:07 📚 Introduction to HTML Tags 19:32:29 📋 Creating Lists in HTML 19:47:43 🖥️ HTML Meta Tags 20:22:12 🧩 Introduction to JavaScript 20:23:35 📦 JavaScript Variables 20:25:14 🌐 JavaScript in Web Development 20:25:56 🖥️ Client-Side JavaScript 20:27:07 🔗 HTML Form Creation 20:29:56 🛠️ Optimizing JavaScript Code 20:45:47 📊 Dynamic table sorting with JavaScript 20:49:10 🌈 Changing background color with JavaScript 21:02:19 📂 Folder Structure for Web Applications 21:17:15 🌐 Handling user input via URL parameters: 21:35 🖼️ Using Templates and Layouts 21:48 📝 Flask Web Development Basics 22:03 🧩 Template Layouts in Flask 22:07:18 📋 Storing user registration data in a dictionary 22:10:18 📝 Displaying user registrations on a webpage 22:34:55 📊 Displaying Registered Users 23:36:23 🧠 Overview of Computer Science Course 23:51:38 💻 Preparing for Post-CS50 23:55:51 📚 Introduction to Review Session 23:56:19 🐍 Python "Hello World" Question 23:57:05 🌐 DNS (Domain Name System) Question 23:58:00 ⏰ Merge Sort Runtime Question 23:59:08 💻 ARG C in C Programming Question 24:00:19 📂 File Opening Function in C Question 24:08:45 🍽️ Valid Way to Print Exclamation Point Question 24:10:23 🖥️ Compiling Steps Question 24:11:02 🤯 Surprise at the Beginning of the Halloween Lecture Question 24:13:20 🌎 Unicode and Emoji Introduction 24:14:28 🍣 Representation of Japanese Foods in Emoji 24:16:06 🌐 Universal Appeal of Dumplings Discussion 24:17:00 🍣 Introduction to Jennifer 8 Lee's Talk 24:20:33 😊 Evolution of Emoji Discussion 24:22:13 🌟 Unicode Consortium and Emoji 24:25:20 🍔 Representation of Food in Emoji 24:27:17 🙏 Importance of Inclusivity in Emoji 24:37:32 📚 Introduction to the Next Section 24:39:20 💾 Memory Hierarchy 24:40:25 💿 Storage Devices 24:41:31 🕒 CPU Clock Speed 24:45:15 💻 System Architecture Quiz 24:48:33 🔄 Algorithm Efficiency 24:56:00 📖 Recommended Books 24:57:52 🎉 Farewell and Good Luck 23:58:00 🔄 Merge Sort Algorithm Analysis 24:00:19 👾 The Duck Debugger 24:03:00 🤝 How Strings Length is Computed in C 24:10:09 🚀 Arrow Operator in C 24:12:54 🍣 Missing Dumpling Emoji 24:16:21 🤝 Involvement with Unicode Consortium 24:29:02 💡 Encoding Characters and Code Points 24:33:07 🌐 Depiction of Race and Nationality in Emoji 24:33:35 🎨 Evolution of Emoji Design 24:36:30 👩🎨 Contributions to Emoji 24:53:46 🔁 Emoji Directionality 24:55:36 🎉 Future of Emojis 25:03:07 🤖 Course Conclusion 25:09:54 🔐 Password Choices 25:10:23 🔐 Password Security 25:12:26 🔓 Cracking a 4-Digit Passcode 25:28:22 🔒 Lockout Mechanism
@Awoken369
He broke things down and explained topics so well. I'm thankful that this was provided for free and thankful to those who uploaded this moment in history.
@IgorKuts