You can watch the previous topic streams in this playlist:

https://www.youtube.com/playlist?list=PLzDmwrrgE-UVnyEtA-_zuffIm3smCO2eA

We have our first topic stream on Graphs in 10 minutes! Since this is the first stream on Graphs, we’ll start with the basics. However, we’ll also cover some challenging problems towards the end. If you’re more interested in advanced topics, feel free to join us during the second hour of the stream. You don’t need any prerequisites to understand everything we’ll cover. Here’s what we’ll go over in this session:

• What is a Graph?
• Types of Graphs
• How to store a graph in a computer
• Checking if a graph is connected
• 1400 Difficulty CF problem
• 1700 Difficulty CF problem
• Characteristics of DFS

https://www.youtube.com/watch?v=l1JQhPBwrsY

The first topic stream on Graph Algorithms:

https://codeforces.com/blog/entry/133099

For further discussions, feel free to join the discussion group:

https://t.me/+GUbLBTEzOZFjOTc0

This week, there’s a contest on Friday, so we’ll have our weekly topic stream on Thursday instead, at the same time (12 - 14 GMT). It’s starting to get more interesting, and we’ll gradually move on to more advanced topics!

https://www.youtube.com/live/egZLWgbShPE

You can watch the previous topic streams here:

https://www.youtube.com/playlist?list=PLzDmwrrgE-UVnyEtA-_zuffIm3smCO2eA

I especially encourage you to watch Graph #1 to ensure you’re on board and ready for Graph #2.

Um_Nik discusses why tourist is no longer at the top 10 of Codeforces.

Four months later, tourist is back on top with over a 200-point rating gap! Lol

https://www.youtube.com/watch?v=paeui52XHZ0

Topics discussed in today’s livestream:

- Bipartite Graphs
- Calculating Distances in a Graph
- Solving 4 Problems from Codeforces

https://www.youtube.com/watch?v=egZLWgbShPE

Based on suggestions, the livestream is moved to 15:30 - 17:30 GMT today.

The second topic stream on Graph Algorithms:

https://codeforces.com/blog/entry/133342

For further discussions, feel free to join the discussion group:

https://t.me/+GUbLBTEzOZFjOTc0

If you find the streams helpful, I’d appreciate it if you could share them with others who might benefit! Give this message a like if you’ve shared it, so we can see how many supporters are out there!

https://www.youtube.com/watch?v=oN_Cnzl5W9c&list=PLzDmwrrgE-UVnyEtA-_zuffIm3smCO2eA

tourist is not a lgm anymore, he is a Tourist now!

The solutions of problems A - F of today's contest:

https://codeforces.com/blog/entry/133411

For further discussion, you can join the discussion group:

https://t.me/+GUbLBTEzOZFjOTc0

IOI 2024 - Current Ranking (after the first day):

https://ranking.ioi2024.eg

The solutions of problems A - G of today's contest:

https://codeforces.com/blog/entry/133585

For further discussion, you can join the discussion group:

https://t.me/+GUbLBTEzOZFjOTc0

I made two videos for people who are newbies right now. I said everything I tell my students to grow and get out of newbie. These are the things that I did myself as well, and around 4 months after being a newbie, I got rank 4 in a div 2 contest. This is the first video on this topic. I highly encourage you to do these things if you are a Newbie right now!

Things you must not do if you are a Newbie:

https://www.youtube.com/watch?v=4yfjspuLfRE

If you like these kinds of videos, let me know what helps you the most, and I’ll try to make more videos on those topics next.

Tomorrow, we’re going to solve some super cool problems from graph algorithms. I’ve chosen some of the best problems, ranging in difficulty, and some are really challenging and beautiful. However, you don’t need any prior knowledge to solve them besides what we discussed in the previous two topic streams on graphs, so anyone at any level can follow along.

Don’t miss this topic stream! I look forward to seeing you all tomorrow!

https://www.youtube.com/live/mDCbr8moyWc

I highly encourage you to watch the previous two topic streams on graphs at 2x speed to ensure you’re comfortable with all the topics!

You can watch them here:

https://www.youtube.com/live/l1JQhPBwrsY

Let me know your thoughts!

This stream has to be moved to Saturday. Sorry about that.