Let's go, 5k coins, only 1500 left till LC cap

Daily (225/373 streak until LC cap)

This is not easy, it is mid, as it is extension of this mid problem (awful problem that tests zero patterns)

https://leetcode.com/problems/determine-whether-matrix-can-be-obtained-by-rotation/description/?envType=daily-question&envId=2026-03-22

#daily #easy #nopattern

Posting random quotes from the book (tcp/ip by Stevens) to recall the fundamentals.

Packet wrapping/unwraping reminder

Daily (225, 373 streak until LC cap)

Good DP problem, I recommend it. There is slightly different (potentially simpler) problem that might be good to solve(check comments)

https://leetcode.com/problems/maximum-non-negative-product-in-a-matrix/description/?envType=daily-question&envId=2026-03-23

#daily #medium #pattern

Daily (227/373 streak until LC cap)

A bit strange problem, but definitely not hard, just a bit cumbersome.

https://leetcode.com/problems/construct-product-matrix/?envType=daily-question&envId=2026-03-24

#daily #medium

Conceptual question, do you know what is "upstream" and what is "downstream" services/components in terms of dependencies or in scope of who calls whom?

Tomorrow will post the answer and explain why so.
As I typically saw a lot of confusion when 2 persons are talking about opposite things

Daily (228/373 streak until LC cap)

Today one of the easiest medium problems I have ever met in leetcode. But I'm scared of this "I", probably tomorrow we gonna have "II" and I'll be fucked

https://leetcode.com/problems/equal-sum-grid-partition-i/description/?envType=daily-question&envId=2026-03-25

#daily #medium #nopattern

Every single CEO after this AI nonsense slope collapses and their vibe coded apps start breaking apart:

Daily (229/373 streak until LC cap)

As I said yesterday, today's daily is really hard and really cumbersome, don't recommend, skip it and have a nice Thursday.

https://leetcode.com/problems/equal-sum-grid-partition-ii/description/?envType=daily-question&envId=2026-03-26

#daily #hard #nopattern

OOOOOOOOOOOOOO shit, because of oncall (btw first time oncall at snowflake, and hard nonsense problem, I actually checked the solution, understood it, explained it, but never submitted it... my streak went away, fuck)
Probably will need to use "time travel" thingy

Okay, fixed it, here we are my 3 digit number on "daily" streak

Daily (230/373 streak until LC cap)

Interesting problem, with a lot of variations, and some useful techniques to learn, references simplified version of similar problem.

https://leetcode.com/problems/matrix-similarity-after-cyclic-shifts/description/?envType=daily-question&envId=2026-03-27

#daily #easy

Daily (231/373 streak until LC cap)

Pretty hard problem, especially hard to understand, hard to build intuition and in general understand what to do. My advice would be to not proceed with that. If you want to still get use of some patterns in this problem (go to comments, I will suggest the prerequisite problem, that is common and might be helpful on the interview)

https://leetcode.com/problems/find-the-string-with-lcp/description/?envType=daily-question&envId=2026-03-28

#daily #hard #pattern

Daily (232/373 streak until LC cap)

Pretty easy, however for the first 2 minutes, initially it seemed harder than easy. However no pattern learnt

https://leetcode.com/problems/check-if-strings-can-be-made-equal-with-operations-i/?envType=daily-question&envId=2026-03-29

#daily #easy #nopattern

Daily (233/373 streak until LC cap)

The same approach as it was yesterday, free problem.

https://leetcode.com/problems/check-if-strings-can-be-made-equal-with-operations-ii/description/?envType=daily-question&envId=2026-03-30

#daily #medium

So officially, Mailchimp, the provider I was using to gather email subs from andreyka26.com - is shithole.

I wanted to test email form and tried to test send it to myself, they immediately marked it as malicious, however it was their default form + some "hello this is test email" text.

Then I bought @andreyka26.com email domain, transferred it, because account was flagged as missing some security/privacy/compliance points. And it still had these "violation" markers, however email is legit, it works, and I want to TEST SEND it to my personal email.

I submitted a complaint to them asking what is wrong with my acc, why can't I send even test email?

The response is "seek for other vendor". Like no way back, no trial to fix, no explanation what exactly I violated. Now again I would need fucking 2-3 days of my life to migrate (if that is possible at all, idk), reintegrate to the blog, etc etc.

Very bad feedback from my side. If you consider mailchimp -> reconsider.

https://paperdraw.dev/

Try this! This is system design diagram tool that can show you the traffic, and prove that it will handle certain rps.

It is paid after 3 simulations, so I gonna vibe code it. It will be a good thing for Messenger article + I will give it to you once I am done, so you can practice with me.