Question before sleep for System Design. We can afford to be eventually consistent, but, we cannot afford data loss and want to be highly available.

Answer to the above's will be soon

Daily

Not that bad, but a bit bullshit. It takes a bit long to build an intuition (I will leave hint for that in comments)

https://leetcode.com/problems/minimum-number-of-operations-to-make-all-array-elements-equal-to-1/description/?envType=daily-question&envId=2025-11-12

#daily #medium

So, there is only 1 correct answer for all the cases:

✅ Consensus(raft, paxos), it will guarantee everything.

❌ Async leader follower - might loose data on leader election
❌ Sync leader follower - does not give high availability, as any follower crash will make system unresponsive, and not able to process writes

✅❌ Leader Leader - depends, if operations are not concurrent we will not loose the data and guarantee high availability, once we write to any leader it will be synced. Concurrency might bring data loss only when Last Write Wins conflict resolution.
✅❌ Leaderless - same as leaderfull, if no concurrent operations - we will not have any conflict with w + r > n, but with concurrent operation, again on read repair when there is a conflict we might override some writes, that got accepted by quorum.

Do you remember this epic game? I need to play it NOW!

Pls, give me feedback about such polls. Did you like it, was it not useful at all, was it too hard, ambiguous? Should I continue using them, or better just posting the "results" in the way: "these are replications that guarantee no data loss"

Daily

Not hard, not bad, greedy problem.

https://leetcode.com/problems/maximum-number-of-operations-to-move-ones-to-the-end/description/?envType=daily-question&envId=2025-11-13

#daily #medium

Stream?)

Daily

Actually a nice one. Kind of "area" line sweep. Nice to learn a bit.

The hint: the intuition you can derive from is try to do it with 1D array and columns updates on it.

https://leetcode.com/problems/increment-submatrices-by-one/description/?envType=daily-question&envId=2025-11-14

#daily #medium

This is the lowest acceptance rate I have ever seen. It is Medium Problem..

Yesterday I initiated my resignation from Microsoft, market feels it

Weekly leetrooms with friends.💪💪💪 in 52 minutes

I remember in my school there was exactly this puzzle:
Can you make 4 liters in one jug having infinite water and 2 jugs with 3 and 5 liters capacity.

Interesting problem to solve

Daily

As I told you before, daily is piece of shit. No way this is medium. But yeah.

https://leetcode.com/problems/count-the-number-of-substrings-with-dominant-ones/description/?envType=daily-question&envId=2025-11-15

#daily #medium

Daily

Nice problem, pretty easy. But you need to recall how to do arithmetic progression: https://en.wikipedia.org/wiki/Arithmetic_progression

#daily #medium

Today is new milestone: 500😎

10 MINUTES AND WE ARE STREAMING!!!!

Another milestone. 100 Daily challenges streak. For cap I will need around 400-500. And then probably I will stop. But now it is deep in the habbit that I cannot start day without Daily Leetcode

Daily

Easy, great start of the Monday

https://leetcode.com/problems/check-if-all-1s-are-at-least-length-k-places-away/description/?envType=daily-question&envId=2025-11-17

#daily #easy