### 18o3's blog

By 18o3, history, 3 months ago,

This year there will be a single preliminary round for all the three sites. The contest will be on Codedrills from 11AM IST on 26th November.

Let's use this blog to discuss the round after it ends.

Best of luck to everyone participating tomorrow.

• +51

 » 3 months ago, # |   0 Today during the mock round, some teams got marks in partial. Does anyone have a idea about that.Also does anybody have the issue where college name is incorrectly showing the "&" as "&".
 » 3 months ago, # | ← Rev. 2 →   0 what's the approach for problem E today ( ICPC mock ) ? Treelection
•  » » 3 months ago, # ^ |   +11 You can find Treelection editorial here.
•  » » » 3 months ago, # ^ |   0 Thankyou sir!!
 » 3 months ago, # |   +19 The contest will start in less than 30 minutes now. All the best.
 » 3 months ago, # |   0 Can someone explain the casework for Three Person Tree Game please.
•  » » 3 months ago, # ^ |   0 after rooting tree at node a. `dfs(a,0); int lc=lca(b,c); if(a==lc)cout<<"A\n"; else if(b==lc)cout<<"B\n"; else if(c==lc){ if(dep[c]==2)cout<<"A\n"; else cout<<"C\n"; } else{ int dista=dep[lc]-dep[a],distb=dep[b]-dep[lc],distc=dep[c]-dep[lc]; if(distb==distc){ if(dista==distb || dista==distb+1)cout<<"DRAW\n"; else if(dista
•  » » » 3 months ago, # ^ |   0 can you explain the logic used to solve this and also the code if you can? I tried finding the intersection node between a, b, and c and did something with the distance between them.
•  » » » » 3 months ago, # ^ |   +12 You were on the right path, you just have to find several cases based on distance inequality. Each of them could lead to different winner.
•  » » » » 3 months ago, # ^ |   0 I used the same approach too. There were just $4$ cases: Sort the distances (non decreasing order), now WLOG, let the smallest distance be $A$ to the intersection node, the 2nd smallest be $B$ to the intersection, and the 3rd be $C$ to the intersection.1) All distances are equal ---> DRAW2) The two smallest distances are equal ---> $B$ wins 3) The two biggest distances are equal ---> $A$ wins4) All distances are distinct ---> $A$ winsIt seems like I missed a case though, which lead to a WA :c
•  » » » » » 3 months ago, # ^ |   0 thought of the same solution but i was too late for fixing some bugs.THANKS!
•  » » » » » 3 months ago, # ^ |   0 So did you try it again? What case did you miss , i was thinking on similar lines
 » 3 months ago, # |   +3 What is the number of slots for each site can anyone tell? For Amritapuri it's 250 but for rest no idea.
•  » » 3 months ago, # ^ |   0 Where does it say 250 slots for Amritapuri?
•  » » » 3 months ago, # ^ |   +3
•  » » » » 3 months ago, # ^ |   0 Thanks!
•  » » 3 months ago, # ^ |   +1 Is there any college cap? We got rank 277 and College rank 1. Can we qualify for Amritapuri?
•  » » » 3 months ago, # ^ |   +1 Yes, you will qualify for Amrita easily. Congrats!
•  » » » » 3 months ago, # ^ |   0 Thanks :)
•  » » » 3 months ago, # ^ |   +3 Hopefully yes because out of top 250 many are from the same colleges mostly IITs, NITs, and BIT so you should qualify
•  » » » » 3 months ago, # ^ |   0 Okay
•  » » 3 months ago, # ^ | ← Rev. 2 →   -8 Chennai regional has approx 100 slots. As mentioned https://icpc-iiitdm.vercel.app/preliminary-rules.pdf
•  » » 3 months ago, # ^ |   0 kanpur 100 ig
 » 3 months ago, # |   0 Is it available in codeforces (gym) ?
 » 3 months ago, # |   +55 What's the qualifaction criteria for amritapuri? My team placed 6th overall but 2nd in college (😓). Do we qualify?
•  » » 3 months ago, # ^ |   +94 If overthinking had a face...
•  » » 3 months ago, # ^ |   +20 congrats for single digit rank! OP!
 » 3 months ago, # |   +12 In the scoreboard there seems to be some teams which have registered for three regionals. Will they be disqualified because in the rules it was mentioned that we have to select only two regionals?
•  » » 3 months ago, # ^ |   0 Such teams have gotten the mail to back out from one region. So finally, they will be considered only for any two regionals.
•  » » » 3 months ago, # ^ |   0 Giving them choice is unfair because then everyone would have registered for three regionals and would have chosen the best two.
•  » » » » 3 months ago, # ^ |   +14 The teams were asked to select the regions before the start of the contest.
 » 3 months ago, # | ← Rev. 2 →   0 My team is 739th Air , College rank 1 . Any chance of Amritapuri regionals ?
•  » » 3 months ago, # ^ |   0 Very Less
 » 3 months ago, # |   +20 Probably The Only day of me being unhappy because of being in IIT, rank-159, college rank -7.
•  » » 3 months ago, # ^ |   +25 Bro we got Rank 70 and College Rank 6 :)
•  » » » 3 months ago, # ^ |   0 Sad
 » 3 months ago, # |   0 I just checked,There are only 194 unique colleges out of top 700 teams.So,those who are getting rank less than 800 will qualify for amritapuri for sure...
•  » » 3 months ago, # ^ |   0 Did you check manually or write a script or something?
•  » » » 3 months ago, # ^ |   +15 I tried web scrapping but codedrills not supported that so did manually using map xD. Took me almost an hour. And this information is accurate so relax. Btw what was your rank?
•  » » » » 3 months ago, # ^ | ← Rev. 2 →   0 Bro u should have prepared that hard !!! you would have been top 50
•  » » 3 months ago, # ^ | ← Rev. 2 →   0 Sometimes , Amritapuri changes their selection criteria by not selecting the top team from every college and instead prioritising rank .
•  » » 3 months ago, # ^ |   0 bro after this new criteria released by amritapuri ,is there any chance of 795 rank(CR-1) qualifying?
•  » » » 3 months ago, # ^ |   0 No bro,teams with rank less than 710 will qualify for amritapuri.Sorry for your loss.
•  » » » » 3 months ago, # ^ |   0 Hii :), How you calculated that?, our team has 775 rank.
•  » » » » » 3 months ago, # ^ |   0 Manually..
•  » » » » » » 3 months ago, # ^ | ← Rev. 2 →   0 I copied rank list in excel read it using a script and like that our rank came out to be around 240. that's why I was asking.After that, the top team from each institute who solved at least one problem is invited until available slots are filled. If the top team is already selected from an institute, it is skipped.How you interpreted this point. if teams is already selected ,institute is skipped?
•  » » » » » » » 3 months ago, # ^ |   0 Yes,your list is Amrita puri special,mine is for overall.So, chances are there.
•  » » » » 3 months ago, # ^ |   0 739 ?
•  » » » » » 3 months ago, # ^ |   0 75% chances are there,because my list for overall not for amritapuri specific.Wish you Luck
•  » » » » » » 3 months ago, # ^ |   0 Let's say IIT Bombay got selected twice below AIR 135 which solved 3 problems. Are they going to be selected again with AIR of 136 if they solved 2 problems ?
•  » » » » » » » 3 months ago, # ^ |   0 Thats confusing, I think they won't select that 3rd team
•  » » » » » » » 3 months ago, # ^ |   +13 Bro instead of thinking these scenarios just git gud
•  » » » » » » » » 3 months ago, # ^ |   0 okay and ?
•  » » » » » » » » » 3 months ago, # ^ |   +5 and try next year
•  » » » » » » » » » 3 months ago, # ^ |   0 looks like somebody has no hope for this year
•  » » » » » » » » » 3 months ago, # ^ |   +8 and who might that person be?
 » 3 months ago, # |   0 Does anyone know, how many seats are there for kanpur region, and I got (AIR 279) and (College Rank 1, for kanpur region), so what are my chances of qualifying for regionals? Also, usually how many days does it take for the results to be declared?
•  » » 3 months ago, # ^ |   0 Probably this should help. link
•  » » » 3 months ago, # ^ |   0 Thanks for the link.
•  » » » 3 months ago, # ^ |   0 This is the list for the previous year, if I am not wrong.
•  » » » » 3 months ago, # ^ |   0 There are 150 teams in the list and this year there are approx 100 teams. Beacuse on site it was written 2023 above so I thought it was of 2023.
•  » » » » 3 months ago, # ^ |   0 Yes
•  » » 3 months ago, # ^ |   0 Bro you were too close,before you there are 106 unique colleges and seats for kanpur is 100 only. Sorry for your loss but you will qualify for amritapuri if you have filled the form.
•  » » » 3 months ago, # ^ |   0 Are you sure? One of my friends checked for the same, and he informed me that there are 86 unique colleges only above us in kanpur region.
•  » » » » 3 months ago, # ^ |   0 I didn't checked for a specific region. It's overall,you can expect some increase in your rank .
•  » » » » » 3 months ago, # ^ |   0 Yeah I guess, in kanpur we might be 87th
•  » » 3 months ago, # ^ | ← Rev. 2 →   +11 Congrats bro you qualified, see you soon in regionals :)
•  » » » 3 months ago, # ^ |   +11 Thanks bro, and Congratulations to you too!! Looking forward to meeting you :)
 » 3 months ago, # |   0 Does anyone know when the results will be out and how many slots are there for kanpur this time? Last time i checked there were approx.150 slots including both kanpur and mathura but this time only kanpur is hosting.
•  » » 3 months ago, # ^ |   0 It is 100 approx slots, as per the selection criteria doc.
•  » » 3 months ago, # ^ |   0 Results are out for kanpur region
 » 3 months ago, # |   +9 The selection criteria for Chennai or Kanpur mention that : Select top 10 (ten) ranked teams for Onsite Contest Remove these 10 teams from the Rank List Select the top-ranked team from each distinct school or institute So top 10 participants from the mixed rank list or the top 10 from the rank list specific to a region will be removed?
•  » » 3 months ago, # ^ |   0 specific to region
 » 3 months ago, # |   +3 Congratulations to everyone who qualified. What is your opinion on difficulty rating of problem A in terms of codeforces difficulty ratings ? (the Virat Kohli century one)
•  » » 3 months ago, # ^ |   +11 Max 1700
•  » » » 3 months ago, # ^ |   +1 Wow so it was not that hard.I remember there were under 100 submissions on it and all onsites have atleast 100 seats. Is it safe to say almost everyone who solved that problem would have qualified ? (Ignoring the college ranking based disqualification)
 » 3 months ago, # |   +4 Anyone else waiting for Chennai preliminary results ?? Please update me with the link if you got it....!!
 » 3 months ago, # |   +6 What are selection criteria for amritapuri?
 » 3 months ago, # |   0
 » 3 months ago, # |   +8 When will the qualified teams for Chennai Region be announced??
•  » » 3 months ago, # ^ |   +3 Results are out now !! Which team are you in ??
 » 3 months ago, # |   0 Congratulations to everyone who made it! Hopefully see you in the next year ¯_(ツ)_/¯
 » 3 months ago, # |   0 Does anybody know when results of amritapuri region will come ?
 » 3 months ago, # |   +14 Diversity hiring is garbage, whether it's for job roles or anything else.
 » 2 months ago, # |   0 all results are out Amritapuri : https://amritaicpc.in/?page_id=157
•  » » 2 months ago, # ^ |   0 Its not opening!
•  » » » 2 months ago, # ^ |   0 It's working on my side, or just go to thier website.