Daily (138 day streak)

Happy Thursday. Very good problem, pretty easy for "mid", go and collect the coin.

https://leetcode.com/problems/maximize-happiness-of-selected-children/description/?envType=daily-question&envId=2025-12-25

#daily #medium

it was third day of vibe coding....

This bitch yesterday, was using one single react component for editing and creating some entity. And it got cycled for 1 hour into same loop:
- both edit and create forms are sending “POST”, request, so edit actually creates new entity
- next cycle point, is when it just sends 2 POST requests for single create forms. Now editing form is correct

And it was for one hour.

Was using Vs code copilot, agent mode, sonnet4.
After some time, I explicitly asked to switch to 2 forms, and separately fixed them.

Besides that switched to sonnet4.5, it was much better.


Why vscode copilot? - cause for last week as Ms employee, it is free for me😁

Daily (139 day streak)

Today is pretty easy (but medium) problem.

https://leetcode.com/problems/minimum-penalty-for-a-shop/description/?envType=daily-question&envId=2025-12-26

#daily #medium

Daily (140 day streak)

Happy Saturday. Today is beautiful hard problem, actually can be solved with bruteforce (in some sense), but has gentle optimized solution.
Not bullshit, great hints, great editorial.

#daily #hard

1k, nice nice.

So now I have to start something new for sure. Soon, soon, something related to system design

Daily (141 day streak)

Happy Sunday, easy problem, you can do bruteforce in 2 mins and enjoy the weekend, or you can try to come up with O(m + n), which is not that hard either.

https://leetcode.com/problems/count-negative-numbers-in-a-sorted-matrix/description/?envType=daily-question&envId=2025-12-28

#daily #easy

Daily (142 day streak)

Cool daily. A bit hard to build a mental model at first, but then it is good mid.

Hint: check the second example and constraints that this cannot be solved greedily.

https://leetcode.com/problems/pyramid-transition-matrix/description/?envType=daily-question&envId=2025-12-29

#daily #medium

Tomorrow officially LAST WORKING DAY for Microsoft. Last training in my gym, last time I'm playing in music room.


Will record the office, so that I have some memories, will post something here for sure.

Yea, it is always a mess on my desk: wires, “booked” free snacks, “booked” bags of tea, docs, etc.

As once was written in meme - this is random access cache for performance optimization

You have probably noticed that there is no "daily" these 2 days. I will do them, for now just for streak I'm submitting the solution from the "editorial", but we will do them as it needs to next days.

This is because of a LOT of stuff I have to do these last days.

Daily (145 day streak)

Happy New Year. First problem in 2026, easy one.

https://leetcode.com/problems/plus-one/description/?envType=daily-question&envId=2026-01-01

#daily #easy

Happy New Year, folks, I am so happy to have you here, you are my motivation to keep going, make content, solve this Leetcode Daily thing, do a System design and so on.


Objectives for 2026.

- Solve leetcode daily for 6500 coins and get fucking leetcode cap

- Complete system design videos / articles, cover top 5-7 topics

- Fully complete articles and story behind leaving Microsoft, Google offer, and offer to company X (will tell you in one week)

- Successfully relocate to Ireland, fix health, at least check health properly 😅

- Publish my symptom journal app to App Store

Daily (143 day streak)
(daily for 30th of December)


Interesting problem more for analysis. You can go direct bruteforce and it will pass, but you will write cumbersome code. Or to analyse deeper and write simpler code

https://leetcode.com/problems/magic-squares-in-grid/description/?envType=daily-question&envId=2026-01-01

#daily #medium

Daily (144 day streak)
(daily for 31th of December)

Nice graph problem, good severity for problem.

https://leetcode.com/problems/last-day-where-you-can-still-cross/description/?envType=daily-question&envId=2026-01-01

#daily #hard