Daily (310/373 streak until LC cap)

Amazing problem again, no jokes. Easier than yesterday's one, again uses the well known pattern.

Highly recommended

https://leetcode.com/problems/delete-the-middle-node-of-a-linked-list/description/?envType=daily-question&envId=2026-06-15

#daily #medium #pattern #recommend

Daily (311/373 streak until LC cap)

Should be marked as easy on these constraints.

https://leetcode.com/problems/process-string-with-special-operations-i/description/?envType=daily-question&envId=2026-06-16

#daily #medium #nopattern

Daily (312/373 streak until LC cap)

As always, second version of yesterday's problem, pretty hard, no real reusable pattern - so up to you I wouldn't spend time on solving tbh.

https://leetcode.com/problems/process-string-with-special-operations-ii/description/?envType=daily-question&envId=2026-06-17

#daily #hard #nopattern

I'll be honest, I really don't think you need to learn that much design, patterns etc, not now, maybe 5 years ago. I already learnt it many years ago, so this is good literature in case you want to learn.

Distributed Systems, storages, networks, queues, OS -> it is a must. This is your expertise that will make less replaceable, as to make decisions for AI -> you need this expertise. Go as deep as you can here.

DevOps / SRE -> for highly critical components, probably will never be fully handed over to AI, so oncall people and SREs will be with us, so worth learning along with docker, kubernetes and clouds.

Security - a must, but my advice, as you fill the gaps in above's you will know enough to spot non-secure stuff straight away.

P.S. I didn't mention algos, because let's be honest in backend I rarely use anything else than dictionary/list, but would be great to cover basic leetcode algos, especially graphs, bitwise/binary operations, and bunch of data structures: trie, list, priority queue, etc.

For gaps that I had: https://t.me/tenfoundation/896

Daily (313/373 streak until LC cap)

This is fucking amazing problem, for real, I'm back to school, when I need to solve math puzzle that is also about something in real life, incredible feeling.


https://leetcode.com/problems/angle-between-hands-of-a-clock/description/?envType=daily-question&envId=2026-06-18

#daily #medium #nopattern

Daily (314/373 streak until LC cap)

We have met this q as daily some time ago, very easy, 1 min coding.

https://leetcode.com/problems/find-the-highest-altitude/description/?envType=daily-question&envId=2026-06-19

#daily #easy #nopattern

Sorry for the silence, everyone - I know some of you were worrying. I'm currently going through a tough personal time right now. Overall, everything is going to be okay, but I just need a little time to recover.

Please keep doing your daily leetcode. I promise I will catch up with all of the problems and post here soon. In the meantime, I’m already planning the next article: Concurrency and Race Conditions for System Design (including real, practical applications).

Soon we are gonna return the regular pace: at least 1 post a day.

Hello all new people, probably from Anna's meet, if you are from somewhere else - pls do let me know, maybe I should say kudos to somebody else.

Quick intro about the channel, and what we are doing here is in "replied".

Btw, Anna is writing stuff here: https://nammemememe.substack.com

you might get a lot of interesting things about FAANG interviews, offers, how to prep, etc.

Now there is going to be bunch of skipped daily leetcode qs that I was solving all that time but never posted. You can skip up until it will be the last one which is today:

1846. Maximum Element After Decreasing and Rearranging

Daily (315/373 streak until LC cap)

Pretty tough one, but interesting.

https://leetcode.com/problems/maximum-building-height/?envType=daily-question&envId=2026-06-28

#daily #hard #nopattern

Daily (316/373 streak until LC cap)

The problem explicitly asks for counting sort -> so just perceive it as good counting sort reminder.

#daily #medium #pattern

Daily (317/373 streak until LC cap)

Pretty easy, but cool problem for challenging some of the leetcode problems. Recommended. Also it is special case of this problem https://leetcode.com/problems/rearrange-characters-to-make-target-string/submissions/2049315140/.
So you can solve 2 problems with one codebase.

https://leetcode.com/problems/maximum-number-of-balloons/description/?envType=daily-question&envId=2026-06-28

#daily #easy #pattern

Daily (318/373 streak until LC cap)

This is hedge fund level of problems. Do not recommend, bullshit and useless.

https://leetcode.com/problems/number-of-zigzag-arrays-i/description/?envType=daily-question&envId=2026-06-28

#daily #hard #nopattern

Daily (319/373 streak until LC cap)

Same as prev one, but tighter constraints. Again, don't recommend, it is the problem they ask in hedge fund, not in FAANGs.

https://leetcode.com/problems/number-of-zigzag-arrays-ii/description/?envType=daily-question&envId=2026-06-28

#daily #hard #nopattern

Daily (320/373 streak until LC cap)

Easy one for bruteforce, pretty hard for the optimized O(n) solution. But bruteforce will pass here.

https://leetcode.com/problems/count-subarrays-with-majority-element-i/description/?envType=daily-question&envId=2026-06-28

#daily #medium #pattern