ICPCNews's blog

By ICPCNews, 6 weeks ago, In English

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Hello, Codeforces!

We are happy to invite you to an exciting online event: ICPC 2022 Online Challenge powered by HUAWEI,which will start on September 15, 2022, 00:00 UTC (UTC+0).

In this Challenge, you will have a unique chance:

  • to compete for 2 weeks online during the challenge
  • to solve 1 or 2 problems prepared by different business domains of HUAWEI
  • to win amazing prizes from HUAWEI!

As a special prize, HUAWEI together with ICPC Foundation will provide the travel trip to the 46th Annual ICPC World Finals in a guest role to the 2 winners (1 winner for each problem)!

Everyone is welcome to participate. It is an individual competition. ICPC 2022 Online Challenge powered by HUAWEI (open to the public): September 15 — September 30, 2022, 00:00 UTC (UTC+0)

This time HUAWEI has prepared 2 challenging tasks for you from different business domains – Data Communication and Cloud.

You are free to choose which problem you would like to solve, and you are also welcome to solve both problems, but please remember the total runtime of both rounds, which start simultaneously, is 15 days only. We hope you'll enjoy this complex yet very exciting Challenge!

Each problem will have its own scoreboard and its own prize fund, so this is a unique chance for you to win double prizes for two solved problems!

Problem No 1: Optimal graph partitioning for fast routing

This problem comes from HUAWEI’s Data Communication business domain, in which routing algorithms have always been a critical issue. In the future, as more and more communication devices are connected to networks, data communication will face an interconnected network formed by ultra-large-scale network devices.

In this challenge, data communication experts of HUAWEI will provide you several network topologies. By dividing them into abstract domains, you need to scale down these topologies and enable quick route calculation, so that fast route convergence can be implemented on large-scale networks. Domain division must address the optimal routing and network scale constraints, so a routing algorithm that effectively divides domains while also meeting these constraints is the core of the algorithm design.

REGISTER

Problem No 2: Topology-Aware VM Placement

This problem comes from another HUAWEI’s business domain – Huawei Cloud. To win the competition in cloud computing market, major cloud service providers are focusing on improving the utilization of cloud resources, as this will allow to reduce the cost of cloud services. It is estimated that even a 1% increase in cloud service resource utilization can save millions of dollars in costs. The optimization of resource utilization, in turn, requires the development of advanced algorithms and technologies for cloud resource management.

The virtual machine (VM) placement algorithm considered in this contest is one of these critical algorithms, which is used to select a physical machine for running a user VM. Since VM requests arrive dynamically, this algorithm works in online fashion. The main goal is to maximize the number of successfully placed VMs. As the algorithm runs on a resource pool of fixed size the more requests are allocated, the less resources are wasted and the more resource efficient is the algorithm. A secondary goal is to maximize the number of VMs placed without violation of additional soft constraints, as it improves the cloud user experience.

REGISTER

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Prizes

Grand Prize (Rank 1):
Problem 1: 15,000 EUR + the travel trip to the 46th Annual ICPC World Finals in a guest role
Problem 2: 15,000 EUR + the travel trip to the 46th Annual ICPC World Finals in a guest role

First Prize (Rank 2- 6):
Problem 1: 8,000 EUR
Problem 2: 8,000 EUR

Second Prize (Rank 7- 16):
Problem 1: 3,000 EUR
Problem 2: 3,000 EUR

Third Prize (Rank 17 – 46):
Problem 1: HUAWEI FreeBuds
Problem 2: HUAWEI FreeBuds

* If the allocated HUAWEI Challenge prize cannot be delivered to your region for any reason it may be replaced by another prize of the same value (if no legal restrictions), at the discretion of the sponsor.

Challenge Rules and Conditions

By participating in this Challenge, you agree to the Challenge Rules and Conditions of Participation

Good luck, we hope this will be fun!

 
 
 
 
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5 weeks ago, # |
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Such a Big Prize Pool, Excited to see the problems, more excited to see the winners!

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    5 weeks ago, # ^ |
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    As a participant, I will participate.

    Spoiler for upvotes:
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      5 weeks ago, # ^ |
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      Can't believe I unfolded all the spoilers above.

      Spoiler
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        5 weeks ago, # ^ |
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        me too, but to tell the truth, this message is very useless and wastes time.

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5 weeks ago, # |
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Excellent cooperation! Can't wait to see the problem!

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5 weeks ago, # |
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Wow,2 weeks&2problems! Is it the same to AHC?

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    5 weeks ago, # ^ |
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    It will probably be the same as last year, *special problem, i.e. AHC.

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5 weeks ago, # |
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Wow! Huge prizes.

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5 weeks ago, # |
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Shouldn't some lucky winners be decided so that everyone is motivated to do this

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5 weeks ago, # |
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Interesting to see the problems

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5 weeks ago, # |
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I have never participated, how difficult are usually these kinds of optimization tasks?

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5 weeks ago, # |
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Will it be rated??

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5 weeks ago, # |
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Thanks, Huawei! I missed this format of competition.

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5 weeks ago, # |
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So interested in this challenge, maybe difficulty is more cause only 2 problems, and a lot of prizes, very excited

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5 weeks ago, # |
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Note The Unusual Time

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5 weeks ago, # |
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Challenges are high so the prizes also.Best of luck who will be participate on this.

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5 weeks ago, # |
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Hey how can I study and prepare for these problems... Can someone please suggest the resources for the same. I don't know these topics but I do want to participate and try and solve the problems. Huge thanks in advance.

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5 weeks ago, # |
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Wow, so many prizes.

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5 weeks ago, # |
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what big prices!

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5 weeks ago, # |
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We are waiting!

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3 weeks ago, # |
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For someone relatively new to programming in general, should I attempt these or are they way out of my league? Because they look very tough

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    3 weeks ago, # ^ |
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    They aren't rated, and after all, it doesn't hurt to try. You might learn something while participating after all!

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3 weeks ago, # |
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Is the Registration finished because I can't participate

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3 weeks ago, # |
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"Only participants who entered a valid ICPC username (email address) during registration are eligible for recognition as a Challenge winner."

So, non-ICPC participants are not eligible for prizes? Can coaches participate for prizes?

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3 weeks ago, # |
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Wooow! The prices are very very interesting!

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2 weeks ago, # |
Rev. 2   Vote: I like it +26 Vote: I do not like it

What is exact contest duration? 15 days (like in contests system) or 2 weeks (like in blog)?
One year ago contest duration was increased for 1 day in the last day. It was unexpected and a little bit unfair.

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2 weeks ago, # |
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..

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2 weeks ago, # |
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Is there a way for unofficial (without prizes) participation for Huawei employees?

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2 weeks ago, # |
Rev. 4   Vote: I like it 0 Vote: I do not like it

Question about test cases of "Optimal Graph Partition for Fast Routing (GP1)".

Why is the graph divided into three subsets? As i understand, it should be divided into two subsets: $$$P=\lbrace \lbrace 0,1 \rbrace, \lbrace2,3 \rbrace \rbrace$$$. In this case $$$ RTsize = 2 + 2 - 1 = 3 $$$.

Also, not divided graph has $$$ RTsize = 4 $$$ and $$$ all $$$ edges are free. This score is more than test solution's score as well.

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    2 weeks ago, # ^ |
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    isn't it against the contest rules to ask questions about an ongoing contest?

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      2 weeks ago, # ^ |
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      The question is about condition, not solution. I suppose it isn't against rule.

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    2 weeks ago, # ^ |
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    The sample output may not be the best solution to the sample input, they are just valid output to demonstrate how score is calculated.

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      2 weeks ago, # ^ |
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      Is the output valid if it don't minimize $$$RTsize$$$?

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        2 weeks ago, # ^ |
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        yes. minimizing $$$RTsize$$$ is not a strict criterion for the validity of the output.

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2 weeks ago, # |
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Hey .. Can u give me down vote ? : )

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2 weeks ago, # |
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can you add an explanation to the test 1??? or even a checker or even said the right answer

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    2 weeks ago, # ^ |
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    You can download the test and review your output, it is actually wrong.

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2 weeks ago, # |
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"Only participants who entered a valid ICPC username (email address) during registration are eligible for recognition as a Challenge winner."

How do you link your ICPC account to Codeforces? Or the only requirement is that the email addresses on Codeforces and icpc.global are the same?

I tried to google how to do it, found that there used to be an option in the account settings (and i vaguely recall that maybe i did something like this in the past) (https://codeforces.com/blog/entry/90185) but there is no such an option in the settings anymore.

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Will this be rated?

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2 weeks ago, # |
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The problems say 0.3*score1 + 0.7*score2 will be used for the rankings, but the scoreboard just seems to add them up. I'm not sure what's going on.

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    2 weeks ago, # ^ |
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    This is not final test data.

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    2 weeks ago, # ^ |
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    The total score on the scoreboard is already weighted sum. For example, if someone got 30 pts for GP1 and 140 pts for GP2 on scoreboard, that means the total sum of score he got on GP1 test cases is 30/0.3 = 100, for GP2 is 140/0.7=200. Hence the total score for ranking is 30+140 = 170.

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      34 hours ago, # ^ |
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      but, there are some testcase in gp1 score is 99xxx,the n most 100000,after weighted, it most 30000

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2 weeks ago, # |
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Is it available to provide a grader for problem 1, GP 2? Thanks.

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2 weeks ago, # |
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Why the submissions were rejudged?

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2 weeks ago, # |
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Are the current testing results that we see in the system final or will there be a separate testing after the competition ends?

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    2 weeks ago, # ^ |
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    Problem 2 has no hidden tests, the scoreboard shows final scores.

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2 weeks ago, # |
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Is it just me who keeps coming back every hour to see if any rated contest has been scheduled ?

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2 weeks ago, # |
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Why nobody answer my questions?

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2 weeks ago, # |
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It has been 48 hours and the ICPC account issue has still not been addressed. No one wants to spend 12 more days working on the problems under the possibility of being informed they are not eligible for the prizes because of some random technicality or unclear prerequisites they do not meet. Last year if I remember correctly there was an option during registration to link our ICPC account, this year I did not get any such option, yet it still seems to be required for everyone?

Please resolve this issue as soon as possible. Is it sufficient to have a personal account?

ELIGIBILITY: To be eligible to participate, Participant must: ... if requested, associate Participant’s Contest Account with Participant’s ICPC account.

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12 days ago, # |
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it's great

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9 days ago, # |
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Rated or UnRated?

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4 days ago, # |
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  1. The rules of the challenge states that Participant’s Contest Account should be associated with Participant’s ICPC account. It is technically not possible now. Previous suggestion to use built-in Codeforces function to associate accounts was not correct.
  2. To participate in ICPC Challenge it is not required to have ICPC account.
  3. To be eligible for the official ICPC Certificate or Sponsor’s prizes it is required to create free account at https://icpc.global with the same username (email) as Codeforces username (email). The fact that the Participant confirms same email in both systems is assumed as confirmation that Participant is the owner of both accounts.
  4. If Participant has already account in https://icpc.global it is allowed to change email in ICPC account to the email used for authentication in Codeforces.
  5. All winners will be notified and additional week will be provided to correct ICPC account.
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2 days ago, # |
Rev. 3   Vote: I like it +35 Vote: I do not like it

When will the system test start?

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    2 days ago, # ^ |
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    Currently it says "final standings" on problem 1 and "system testing" on problem 2. Wasn't it announced the other way?

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2 days ago, # |
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Where is system test? ICPCNews

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45 hours ago, # |
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When will the system test start?

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45 hours ago, # |
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When will the P1's system test start?

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44 hours ago, # |
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Will it be evaluated as the last submission rather than the highest score?

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    43 hours ago, # ^ |
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    Yes.

    After the end of the coding phase, the last submission that scored a positive number of points on the pre-tests will be selected. It will be retested in the final tests. The rest of your submissions will be ignored. The final tests are secret and not available to the participants, they are mostly realistic. The result obtained on the final tests is your final official result for this problem.

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      42 hours ago, # ^ |
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      I submitted the code for GP1 to GP2, and that's my last submission to GP2. It's so sad.

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43 hours ago, # |
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When will the system test end?

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41 hour(s) ago, # |
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Does this rule only apply to Problem 1, or to both problems:

General announcement ***** When the contest is over, then for each participant the last submission will be selected (which scored non-zero points). This particular submission will be tested on the main test suite (other submissions will be ignored). ?

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    41 hour(s) ago, # ^ |
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    The same question! This is the first time I see this rule

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    40 hours ago, # ^ |
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    Problem 2 clearly states:

    Your solution will be judged based on multiple tests. The test set is fixed during the whole contest, no retesting of solutions on extra tests will be made.

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      40 hours ago, # ^ |
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      Yes, the test set is fixed, but which "solution" that will be tested? that's the question. The last submission or the best one?

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        40 hours ago, # ^ |
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        To my understanding, there will be no re-testing at all for problem 2. That's also how it was handled last year at both Huawei contests, so problem 1 is more of an outliner.

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39 hours ago, # |
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How to get 800k+ score on Problem 2? Can someone share main ideas to do this? Do you have different solutions for different slices of cases, or your solution is universal for every case?

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    38 hours ago, # ^ |
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    Could you also share your solution idea? Your score is also quite high :)

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39 hours ago, # |
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For people who got 200k+ on both GP1 and GP2: How did you get such a score? Personally, I tried to minimize $$$RTSize$$$ by setting a limit on the component size to $$$\lfloor c \sqrt{N} \rfloor$$$ when $$$c$$$ is a constant marginally bigger than $$$1$$$. What was your approach?

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    39 hours ago, # ^ |
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    Choose one spanning tree of the graph , and do some greedy solution on the tree.

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    38 hours ago, # ^ |
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    If you fix some upperbound $$$B$$$ on the component size you allow, and fix some spanning tree, you can try to split the tree into minimum number of connected components of size upto $$$B$$$. This dp problem is solvable in $$$O(n)$$$, so you can try to fix multiple values of $$$B$$$ and take the best found. For instance I tried iterating on bounds starting from 1 to $$$n$$$, each time multiplying by 1.7. There isn't really any point in trying small bounds but it barely hurts (the actual useful attempts are those around $$$\sqrt{N}$$$).

    You can independently try this on multiple spanning trees. This works well on GP1 since the weights don't matter, and on GP2 this is decent to try this on the MST (as a heuristic).

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      38 hours ago, # ^ |
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      Actually your approach seems to be very similar to mine. The only difference is that instead of splitting the spanning tree, I tried to construct the components, just like how Kruskal works. With the size optimization on the DSU, we readily have information about the component size (so we can reject merging two components when the combined size exceed the bounds)

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        37 hours ago, # ^ |
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        Well if I recall correctly, it's sufficient for 200k+ on both subproblems. Of course you need to use other approaches to nail more difficult cases (on GP2).

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38 hours ago, # |
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Why do I get Judgement failed on my submission to problem 1?

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37 hours ago, # |
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will we be able to submit additional solutions to the problem1 just to test out some other ideas on the full test data?

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37 hours ago, # |
Rev. 4   Vote: I like it +39 Vote: I do not like it

I feel very sad. TLE has a set of test cases.

The final score is 507618*0.3+1350210*0.7=1097432.

After multiplying by the coefficient, everything may not be in vain.

In the future, I will not participate in such a competition with only one submission opportunity, because it is too risky. I don't want to waste a lot of time and get nothing.

#9: Time limit exceeded [4000 ms, 412 MB]

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36 hours ago, # |
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There are only two kinds of points in GP1: 60w or 65w. This is a huge difference but they have no any difference on pretest. It's totally random and I think it is really unfair. In addition, participants can't know whether they get RE/TLE/MLE on final test, which caused great uncertainty.

To some extent, P1 is a competition for luck. It's a huge mistake to participate in a contest like this.

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    36 hours ago, # ^ |
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    I am thinking the same. As these are approximate algorithms, longer the time it can be run larger points can be produced. Running additional testcases after contest doesn't make sense for me as one cannot know the right balance whether to get larger points by running algorithm close to time limit or to sacrifice some points just not to get time limit exceeded after contest.

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    35 hours ago, # ^ |
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    I'm sorry for your decrease in a single position, but I don't think it's unfair.

    If anything, I think it was predictable that the final positioning is ought to have some deviation from the standings throughout the contest. In the "Scoring" section you can see it's stated to have additional secret tests (and furthermore, that the pretests are not counted to the final score). I don't want you to feel down, but it should be clear that overfitting solutions to the pretests (whether overfitting on time, memory or specific instances that appear on the pretests) is a bad idea.

    It definitely, partially relied on luck, the point was to approximate your average position throughout the contest. 600k vs 650k is unfortunate but if you put yourself tight on the 5 seconds time limit on pretests, you can't expect to pass everything for sure.

    I think it's an exaggeration to call this a "competition for luck" or a "huge mistake to participate", and you should be grateful for your 2nd position and considerable prize.

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      35 hours ago, # ^ |
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      As a contestant, I can't agree with you because we spent a lot of time. The last one has too much uncertainty on the unknown test set. Someone may not get a good result because of this data set, but his method can be more valuable if slightly modified. The participant's method has certain value to the enterprise, but because of some uncertain factors, the participant did not get anything, which is unfair.

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        35 hours ago, # ^ |
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        We should differentiate between what is unfair, and what the contest should have been.

        I do agree that the contest would have been more valuable to Huawei, if there were no secret cases, and furthermore it would be more realistic to give us the entirety of the testcases and make the problem "output only", without a small time limit (yet this poses the problem of people with different computers).

        Your case is extremely unfortunate and I'm sorry for that. But in my opinion, once all the contest rules have been set as they are (even if we disagree with them), no rules were changed and by participating you are knowledgable to all the outcomes, you can't call this unfair.

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          35 hours ago, # ^ |
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          Therefore, I accept the present result under the rules. But I still think this rule is unreasonable. As a contestant, I have no way to change the rules. I can only choose to refuse to participate in competitions with such rules in the future.

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      35 hours ago, # ^ |
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      Maybe it's an exaggeration for GP2, but for GP1, the score really depends on luck. The score in pretest literally has no correlation to the final score. It's nearly random.

      I still think it's not worthy to participate in a contest like this. One of my friend also participated in this contest, and he was top 10 before the final testing. Because he got MLE on many testcases, he can't get any prize now. The rules of this contest greatly increase the uncertainty and make participants take risks of wasting a huge amount of time.

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        35 hours ago, # ^ |
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        Your comment is more proper as a feedback to the people who prepared the competition, that they should have prepared it otherwise.

        And the standings are nothing like "nearly random", the relative positioning did not change too much for most of the people. In fact it's similar to a usual CF round, with the exception of the duration. So in my opinion you don't present a proper complaint, as I mentioned in my other replies.

        Edit: didn't see that you talked specifically on GP1 (thought you meant P1). In that case you're right, but idk how the authors could predict this (unless they really put unrealistic testcases, but I can't compare between them). Still, the MLE should be more predictable than simply "non-correlative testcases".

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36 hours ago, # |
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How to get my prize?

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36 hours ago, # |
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What does the question mark in the leaderboard mean?

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    35 hours ago, # ^ |
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    They're being retested. (Why some solutions are always being retested? They have been tested many times.)

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      35 hours ago, # ^ |
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      Yeah, why some solutions are always being retested? They have been tested many times. If they use random until they get the best answer, it's unfair to other contestants!

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36 hours ago, # |
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ICPCNews

Please consider ignoring my last submission for GP1 and judge pre last submission for GP1.

It is moodily that I sent solution intended for GP2 to GP1 and now I have score equal to 25 instead of 600k/650k. I didn`t notice this submission as I sent it on day 7 of the contest and I was fully concentrated on GP2 on day7.

I think I am not the only person with such (or similar) problem and standings table is misleading during contest in this regard.

I understand that rules are rules, but it is so unpleasant to spend 15 days solving problems all day/night long and have 25 score becouse of one missklick...

Hope for your understanding.

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35 hours ago, # |
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Please evaluate all submissions. It's so unfriendly to only judge the last submission, as the final test is unavailable to participants.

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    35 hours ago, # ^ |
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    Many people used random solution.So it will be unfair to people with fewer submissions.

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35 hours ago, # |
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Why are there so many REJUDGE for TLE code? This can make people who use uncertain random seeds score higher. I have seen some players lose their original rewards because of this.

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31 hour(s) ago, # |
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Problem 2 was very nice. Unfortunately I did not have enough time to converge on a solution that can remain very tidy in the face of item deletions. Congratulations to the winners!

Are you planning to reopen submissions in the near future?

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31 hour(s) ago, # |
  Vote: I like it +32 Vote: I do not like it

Is the contest allowing any soon seeing codes of participants? It would be interesting to check the top solutions.

P.S. just curious, is the winner of Problem 1 really from North Korea? :) & Congrats to the winners!

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20 hours ago, # |
  Vote: I like it +26 Vote: I do not like it

Are these final standings? I found that scores didn't multiply by 0.3 and 0.7 for GP1 and GP2.