Hello, Codeforces!
We, Algorave, have curated a Solo Practice Contest in the gym, Coding Challenge Alpha VIII — by Algorave. The level of questions is medium. This is for anyone who loves giving contests and solving problems. This contest will be of most interest up to Expert rated coders, but I would also like to invite Div. 1 coders to participate as well. For anyone who wants to practice or just wants to go through the problems can register for our contest here. Hope you will enjoy solving the problems!
A massive thanks to:
our problem setters: neal27, ShivamKapoor23, Utkarsh59, MadhavCoding, and Lazy_Seg_Tree.
our problem testers: _bLIC_, wolgwang, vanshdhawan60, kanishkgupta071, and BitWizz.
JainWinn for the amazing poster design.
Contest Details:
- Date/Time: 28.03.2025 17:30 (Московское время)
- Problems: 6
- Duration: 2 hours
- Contest Invite: Invitation Link
We hope that this contest, regardless of your background, rating and result, will increase your exposure to competitive programming and make you better than you were yesterday. Have fun!
Note: You can also register for the contest while it is going on. You may want to check out our group for past contests.
glhf:)
UPD1: The registration has started!
UPD2: The contest has been postponed by 1 hour due to a queue on Codeforces.
UPD3: The contest has been rescheduled to Friday, March 28th, due to the long submission queue on Codeforces. We kindly ask you to review the updated contest timings and apologise for any inconvenience this may have caused.
UPD4: Contest begins in half an hour! All the best!
UPD5:
Congratulations to the winning contestants!
Congratulations to first solves as well!
- A: Gokuu007
- B: __baozii__
- C: __baozii__
- D: Sofapuden
- E: __baozii__
- F: cyclop5
UPD6: Contest is made private, you can access the contest with this link.
UPD7: Editorial is out! Thank you all for participating, see you soon!
All the best to all who are gonna participate.
As a problem tester, I really liked the problems and highly recommend everyone to participate in the contest !
I hope, every participant finds a non-empty subset of problems interesting.
why the authors so orz tho 😩 😩
Utkarsh59 neal27 MadhavCoding
All the best to everyone participating!
As a problem setter, I hope you would enjoy solving the problems!
As a tester, I can say the problems are worth your time, good luck and have fun!
Tested, tuned, and set—now it's your turn to solve! Enjoy the contest!
looking forward
As a tester, I enjoyed each problem. Hope you will enjoy it too!!! ;)
Queue is still infinitely long -- does this contest bypass?
i totally wasted 2hrs of my time just for waiting
Sorry for the inconvenience, but running the contest in the long queue would have only made the experience worse, so we waited, but it's still long.
pls allow to see others submissions
Done
Shoutout to MadhavCoding neal27 Utkarsh59 for cooking harder than my kitchen ever could.Very nice contest.
Orz!! a very good contest indeed.
Good problems. Waiting for editorial
gr8 questions
editorial please:)
Could anyone kindly share an idea or any hint for Problem B? I would really appreciate it!
Aim is to maximise $$$\Sigma (p_i * (d_i - f_i))$$$. Firstly, break this sum into two separate sums: $$$\Sigma (p_i * d_i)$$$ and $$$\Sigma (p_i * f_i)$$$. The first sum is constant, so now focus on minimising the second sum that is being subtracted, in order to maximise the overall sum. Can you find a greedy strategy to find an optimal ordering of tasks?
Doing tasks in decreasing order of $$$p_i/b_i$$$ will be optimal. This can be proven by an exchange argument proof, which will be provided in the editorial.
my first "first solve" : )
Please provide editorial
yar editorial daldo 💔 💔 🥀 🥀
We are working on it, It will be available in a day or two.