shivamg_isc's blog

By shivamg_isc, history, 6 weeks ago, In English,

Aparoksha is back with the flagship coding event — Alkhwarizm

2 years back, we launched the first ever External Rated Contest on CodechefAlkhwarizm 2017.
Last year's Alkhwarizm 2018 was a great success with over 1100 people participating in the contest.
If you have the appetite for algorithmic problem solving, then don't miss it out!

Contest link is here — Alkhwarizm 2019

It will be a 5 hour individual contest with algorithmic problem-set of diverse nature, and is open for both students as well as professionals.
The contest will comprise 10 problems, and will be rated for both divisions.

The prizes include cash prizes worth INR 20,000, along with Codechef Laddus.

  • For Indian participants:
    • Top 10 from ranklist will receive 300 laddus.
    • Additionally, they get bonus laddus (Bonus = n — contest rank) where 'n' is 11 for short contests.
  • For Global participants:
    • Top 10 from ranklist will receive 300 laddus.
    • Additionally, they get bonus (Bonus = n — contest rank) where 'n' is 11 for short contests.
  • For combined participants:
    • Random Laddus to any 5 users: 200 laddus.
    • First to solve each problem individually: 100 laddus.
    • Country wise participation: Top 10, 20 and 30 will get 30, 40 and 50 laddus as per participation.
    • Country wise performance: 200, 250, 300 laddus as per performance.

So be ready to have a nail-biting experience on April 7, 2019 at 21:00 IST

The problem have been set and tested by satylogin, blake_786, shivamg_isc, priyanshupkm, modi_aashu2, fLUKEmASTER and idiot_owl.

Some of our previous contests — CodeRed 2019, Alkhwarizm 2018, CodeRed 2018, Alkhwarizm 2017, and HumbleFool Cup 2016.

Register here to be eligible to sit on the Iron Throne.

Good luck everyone !

Upd 1 — The contest is about to begin in 1.5 hours.
Upd 2 — The contest is over. Thanks for the huge participation.
And we are sorry for this unbalanced contest.
The initial version of the contest was perfectly balanced. But, each problem of external rated contest has to be reviewed by few people from Codechef.
The initial version of the contest was told to be made rated just for Div 2.
The problem right now with 3rd least number of submissions was marked by them as an EASY-MEDIUM problem, and similarly were the others.
We tried to convince them to make the contest rated for all, as we felt the contest was indeed balanced.
But, finally in order to make the contest rated for all, we had to add harder elements to most of the problems.

We in a way could have agreed to keep the contest rated for just div 2, but that would remain unbalanced for them similarly.
We are sorry again, but please try to understand that the error was not on our part entirely.

Thanks !

The hints will be posted soon.

Upd 3

Congratulations to the top 3 Global winners :D
1. step_by_step — 8 problems
2. KrK — 8 problems
3. uwi — 7 problems

The hints are as follows —

Danny Wants To Know
Weirwood Trees
They are COMING
Arya and the Grid of Stars
Winter Is Here
Cersei and her Soldiers
Game of Theory
Our Enemy does not Tire
Conquer Beyond the Wall
I Promised to Fight for the Living

Detailed Editorials will be posted soon :D

 
 
 
 
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6 weeks ago, # |
  Vote: I like it +1 Vote: I do not like it

when will be rating get affected?

Either before the long or after long.

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6 weeks ago, # |
  Vote: I like it +30 Vote: I do not like it

What an unbalanced contest!

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    6 weeks ago, # ^ |
      Vote: I like it +15 Vote: I do not like it

    Yeah, we understand that. :(

    Please refer to the post above for the reason behind this mishap.

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6 weeks ago, # |
Rev. 3   Vote: I like it 0 Vote: I do not like it

Isn't the intended solution for THCOM was dp + convex hull trick? I don't get why I was getting TL. Code

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    6 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    I too got a TLE using dp + convex, but later just pre-stored the path lengths and number of edges and then used convex hull. Refer code

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6 weeks ago, # |
  Vote: I like it +23 Vote: I do not like it

Highly unbalanced contest :(

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6 weeks ago, # |
  Vote: I like it +6 Vote: I do not like it

I have never seen a contest become unrated just because it is unbalanced. Most of the Codechef short challenges are unbalanced and they still remain rated. This is the second time where an external rated contest becomes unrated :/.

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6 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

Hey, I am actually having Difficulty believing that CodeChef denied rated for all status to your contest. I conducted a rated for all contest "ENIGMA" on 10 January link. This was a perfectly balanced contest according to me with basically 2/3 difficult problems. I guess the duration of the contest you kept created this issue since 5 hours is a long time. BTW Who did your review?

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    5 weeks ago, # ^ |
    Rev. 2   Vote: I like it +9 Vote: I do not like it

    This was the moderator's reply after we made existing questions from our side fine enough.
    There were sufficient medium to medium-hard questions according to us even before receiving this mail.
    After receiving this mail, we had set 2 more harder questions.
    The contest kept getting tougher and tougher.

    I don't feel it right to reveal his/her name, but we both know who the person is :P

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    5 weeks ago, # ^ |
      Vote: I like it +12 Vote: I do not like it

    Also, yes 5 hour duration is long. But it doesn't mean that you end up making a contest similar to a Codechef Long Challenge or Hackerearth Circuits.
    At least 2 more problems from the contest must have been solved by >50 participants.

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5 weeks ago, # |
  Vote: I like it +4 Vote: I do not like it

when detailed editorial will be released?