Daily (215/373 streak until LC cap)

Not bad problem, but pretty hard (for me), but it is graph related problem therefore - I like it

https://leetcode.com/problems/maximize-spanning-tree-stability-with-upgrades/?envType=daily-question&envId=2026-03-13

#daily #hard #pattern

Daily (216/373 streak until LC cap)

I'm not sure about this problem. It requires a bit of math, but overall, not bad

https://leetcode.com/problems/minimum-number-of-seconds-to-make-mountain-height-zero/?envType=daily-question&envId=2026-03-13

#daily #medium #nopattern

Daily (217/373 streak until LC cap)

Good medium problem, I liked it, not very hard

https://leetcode.com/problems/the-k-th-lexicographical-string-of-all-happy-strings-of-length-n/description/?envType=daily-question&envId=2026-03-14

#daily #medium #pattern

This one is not forgotten, today I am coming back to Dublin and will start working on the article. Since it got like record (53!!!) I will also add a bit of visuals for system design (God blesses AI agents).

Your opinion and feedback is really valuable.

Daily (218/373 streak until LC cap)

Bullshit a bit in a sense that 99.999% this will never be needed in real interview, as it is math and specific theorem needed.

Sorry, I'm after Kinedryl, so I'm still flying high after the flight to Dublin, I can't really grasp the math. My advice - skip this nonsense for now.

https://leetcode.com/problems/fancy-sequence/description/?envType=daily-question&envId=2026-03-15

#daily #hard #nopattern

Daily (219/373 streak until LC cap)

People generally don't like this q, but keep in mind it can be solved as bruteforce

https://leetcode.com/problems/get-biggest-three-rhombus-sums-in-a-grid/description/?envType=daily-question&envId=2026-03-16

#daily #medium

Daily (220/373 streak until LC cap)

Basically no pattern here, just some unique trick (some people suggest you need to do 2 hards to understand the intuition, but I wouldn't agree with that fully). Added simple visual for building the intuition and solution explanation

https://leetcode.com/problems/largest-submatrix-with-rearrangements/description/?envType=daily-question&envId=2026-03-17

#daily #medium #nopattern

https://www.linkedin.com/posts/jamesgosling_in-wake-of-outage-amazon-calls-upon-senior-activity-7439624073569202176-jL4P/?utm_source=share&utm_medium=member_ios&rcm=ACoAACNA3YkBiddSU4CK9T1xhbizRWv80xoSZ8A

Trully believe this is the trend, and hope it will stay the same so they don't fucking fire everybody

Daily (221/373 streak until LC cap)

Good, pretty easy problem. Actually uses leetcode pattern, so highly recommended

https://leetcode.com/problems/count-submatrices-with-top-left-element-and-sum-less-than-k/description/?envType=daily-question&envId=2026-03-18

#daily #medium #pattern

Posting random quotes from the book to recall the fundamentals.

Some years ago as I was exploring tcp/ip stack practically, I created HTTP server using tcp layer, but I was wondering HOW CAN I write my tcp implementation. The answer is here: everything below tcp(inclusive) is kernel mode. So it is not that easy/impossible to replace it with your impl - so you got to work with socket() os api, and choose between udp/tcp.

Daily (222/373 streak until LC cap)

Pretty same problem as yesterday with small modification.

https://leetcode.com/problems/count-submatrices-with-equal-frequency-of-x-and-y/description/?envType=daily-question&envId=2026-03-19

#daily #medium

ahahhaha. The guy contacted my colleague in Linkedin with: "can you share the questions you have been asked during the interview".

He shared general recommendations and sent my article. Literally the same guy after 5 mins:

Daily (223/373 streak until LC cap)

Bruteforce works here, just emulate what is said. I'm looking forward to end these matrix problems, don't like that, they all are somehow cumbersome or something.

https://leetcode.com/problems/minimum-absolute-difference-in-sliding-submatrix/description/?envType=daily-question&envId=2026-03-20

#daily #medium #nopattern

Amazing friday pre-working vibe today. After dark winter, sun feels COOL.

This will be my peak time, my prime, someday… ofc if AI wont replace me

Daily (224/373 streak until LC cap)

Easy problem. This week I feel myself as in my old 2018-2019 transposing matrices every single day, the only thing that is off is that back than I was using c++ in uni.


https://leetcode.com/problems/flip-square-submatrix-vertically/description/?envType=daily-question&envId=2026-03-21

#daily #easy

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