Shayan | International Grandmaster on Codeforces

Teaching algorithmic thinking and how to crack interviews. PhD @ UMD

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@HelloVyom Hi,
https://t.co/2RuhPxq7bL

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@Akasheth_ https://t.co/2RuhPxq7bL

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@repovive @_AmShZ_ Another Premier Round!

[Repovive. @repovive]

We are back with another Premier round!

🏆 Repovive Premier Round 4

📅 Sunday, 24 May 2026 | 14:35 UTC

⏳ Duration: 2 hours, 30 minutes

🔗 Register here: https://t.co/7RIUgHpjYj

📖 CF Blog & Details:https://t.co/kxk2CtJWU6

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@nalinrajput23 I’m afraid if I say delete grok grok deletes me

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@kaaaash____ 14

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@mchulet Hey, I’m cofounder of https://t.co/2RuhPxq7bL

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@Tech_girlll - Claude has gotten unbelievably dumb. It’s too hard to bear now.
- GPT 5.5 was really a jump.
- Codex currently gives you more usage on the $20/month plan comparatively.

I have the max plan for both, but I’m using Claude only as backup now. It wasn’t like this two months ago.

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@_AmShZ_ 😂😂

[AmShZ @_AmShZ_]

I wrote Problem B from the latest Repovive Premier Round:

https://t.co/yv7zuTEp3d

It has a hash-based solution, but there is also another solution with surprisingly short code.

Can you guess it? Drop your ideas in the comments.

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@_AmShZ_ Amazing problem

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

Is there any Codeforces for SWE contests or should we build it?

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@repovive Glad that finally a Premier round is gonna be back up!

[AmShZ @_AmShZ_]

In DFS, which convention do you use for naming the current node and its neighbor?

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@_AmShZ_ Uh, miss this so much

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@HamzaHassanain0 Yeah I think that's irresistible lol

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

Every day that passes, I think more about why no one builds simple wrapper over LLMs and makes sure it never uses em dashes, “master,” and “deep dive”. It’s super simple, and I would personally buy that. I’m really sick of this shit.

[Shayan | International Grandmaster on Codeforces @ShayanCJahan]

@_AmShZ_ It’s great to see we’re getting better

[AmShZ @_AmShZ_]

Which algorithm felt useless at first, but became one of your favorites later?