UPD:

permutations *= cnt -> 3000ms
permutations = permutations * cnt -> 3000ms
permutations = permutations * cnt % mod -> 17ms
permutations = (permutations * cnt) % mod -> 17ms
permutations *= cnt % mod -> 3000ms

For now seems strange

Actually makes sense. The smaller the numbers the quicker the multiplication.

p *= cnt % mod will be converted to p = p * (cnt % mod). So basically we will always work with bigger numbers

Order of operations isfrom left to right for ‘*’ and ‘%’ as they are same “rank”

Daily (124 day streak)

Happy Thursday. Amazing problem, I love problems that are representing some abstract model, that you can imagine, or even better - real world model, rather than just some numbers. Today is exactly that type of problems

https://leetcode.com/problems/count-covered-buildings/description/?envType=daily-question&envId=2025-12-11

#daily #medium

Fun fact, did you know you can add contributions/commits to github for the past and for future days. E.g. just added for 24th of Dec.

My ex techlead has shared the fun repo, and I was really doubting how it can add for the past or for the future, but it can for new empty repo

https://github.com/Shpota/github-activity-generator

I love Google ecosystem for personal use, Tasks, Calendar, Keep (notes), Drive/Docs, etc.

The only one thing I was not happy about Google Notes (Keep) is rich text editing (bold, italic formats, headings, etc).

THEY HAVE ADDED IT!!!

Was waiting for it for 3-4 years. On top of that every now and then I see improvements and new features for Google Tasks.

Love Google. At some point I will be hired there. Want to work on some of these personal / time management tools.

Daily (125 day streak)

Actually nice problem. Feels like some version of real engineering problem that somebody had.

https://leetcode.com/problems/count-mentions-per-user/description/?envType=daily-question&envId=2025-12-12

#daily #medium

Daily (126 day streak)

Happy Saturday. Today is easy, so few mins problem - get your coin.

https://leetcode.com/problems/coupon-code-validator/?envType=daily-question&envId=2025-12-13

#daily #easy

You watch as well?

Feeeh, Navi(((

Daily (127 day streak)

It is Medium+ or even Medium, not Hard for sure. Especially given the hints.

https://leetcode.com/problems/number-of-ways-to-divide-a-long-corridor/description/?envType=daily-question&envId=2025-12-14

#daily #hard

Vibe.

Goal is to eventually finish this book before 2026. I gonna do a review, cause in my opinion the book is REALY overrated.

What do you read nowadays?

Btw, I started 2 years ago. Slowly but surely. Really boring and redundantly complicated book

Daily (128 day streak)

Happy Monday, easy one, or easy-mid. Good problem - go and collect the coin.

https://leetcode.com/problems/number-of-smooth-descent-periods-of-a-stock/description/?envType=daily-question&envId=2025-12-15

#daily #medium

today's daily is hard, this is acceptance rate. But we are strong, there is discipline, so we gonna make it, however not before I go sleep

fuck it, tomorrow watching editorial. I came up with dp then realized the budget is shared var between dp subproblems(

Daily (129 day streak)

The hardest dynamic programming question I have every had. First time I see that DP function returns not scalar, but map that should be merged. No way I'm solving it within 1 hour, however initial idea was almost fully correct

https://leetcode.com/problems/maximum-profit-from-trading-stocks-with-discounts/description/?envType=daily-question&envId=2025-12-16

#daily #hard