Solution

Hint1: try sorting.
Hint2: the solution should be O(n^2)

Hint3: sort by x asc and then by y desc. Basically you can observe that next x is always bigger or same as previous. Now whenever previous y was higher than current y - you cannot count it as previous y for sure will be inside the rectangle.


===

Didn't come up with it on my own. Had to see the solution. In a nutshell, as per last hint, we just track change of Y between current and previous. If current is higher we count one. This way we make sure there is no point inside the rectangle

extremely good advice would be (for job security) - go and start working on some OOOOOLLLD legacy, that brings money, and literally not replaceable. You will never be replaced. You can only be laid off, or dropped in case project got replacement and stopped bringing money

Or, spend time on grinding your interview skill (leetcode, system design, intw questions), to feel extra confident and know that even in case of drop, in 1 month, you will find something else.

Airport leetcode once more

Daily

Today leetcode is a joke. Literally problem for 40 seconds. Go and collect the coin.


https://leetcode.com/problems/find-closest-person/description/?envType=daily-question&envId=2025-09-04

Solution: just measure absolute distance and return the one which is less

Daily

Math💀. Was not able to solve on my own.

https://leetcode.com/problems/minimum-operations-to-make-the-integer-zero/description/?envType=daily-question&envId=2025-09-05

I added different structure for daily leetcode questions. Now answer with hints will be in comment section instead of separate post. Hope it will make things clearer. I'm 100% sure, maybe 1% of you are doing it with me, but at least for this 1% it will be extra motivation and competitive feeling (this guy did it today, I can do it as well)

Just realized I'm 25.... wtf is this, I feel like maybe 19-20 still

Daily

Bruteforce - quite easy, but we need something better than O(n*m)
Optimized - might be a bit hard

https://leetcode.com/problems/minimum-operations-to-make-array-elements-zero/?envType=daily-question&envId=2025-09-06

Tomorrow we are streaming during the day: 14-16 UTC + 2
Implementing Redis Sharding POC (basically emulating real redis)

Started

https://www.youtube.com/watch?v=qr8WUdzJN9k&ab_channel=andreyka26_se
https://www.twitch.tv/andreyka26_

Daily

Easy one, go and collect the coin


https://leetcode.com/problems/find-n-unique-integers-sum-up-to-zero/description/?envType=daily-question&envId=2025-09-07

#daily

Daily

Easy one - go and collect the coin, guys.

https://leetcode.com/problems/convert-integer-to-the-sum-of-two-no-zero-integers/description/?envType=daily-question&envId=2025-09-08

Today let's play Starcraft2. In 2-4 hours

Daily

Today is interesting question. not bullshit math at least.

https://leetcode.com/problems/number-of-people-aware-of-a-secret/?envType=daily-question&envId=2025-09-09

#daily

Daily

Today quite interesting problem, I liked it, it is legit mid.

https://leetcode.com/problems/minimum-number-of-people-to-teach/description/?envType=daily-question&envId=2025-09-10

#daily

Daily

Today mid feels like easy. Solved in 2 mins, go and collect your coin.

https://leetcode.com/problems/sort-vowels-in-a-string/description/?envType=daily-question&envId=2025-09-11

#daily

Ahahhahah so accurate.
This is my CZ skill after 3.5 years here