Invitation to CodeChef October Lunchtime 2019

ankit_btech · October 26, 2019, 6:13pm

I kept getting WA on the small test case. In fact, I tried asserts and it seems that there is an issue with test cases. I tried A_i\ge -10^9 and it gave SIGABRT!

aert · October 26, 2019, 6:13pm

Did anyone get the first subtask right ?

sayanmedya · October 26, 2019, 6:16pm

Same happened to me, I think. I don’t know FFT and other stuff but, CodeChef: Practical coding for everyone this O(n*n) solution should pass the first test case. Isn’t it?

ankit_btech · October 26, 2019, 6:16pm

Haha, yeah! Looks like the same setter as Game of ORs in ICPC

akshay1_2 · October 26, 2019, 6:24pm

can you check my solution ?? It gives Wrong Answer for subtask1.

sayanmedya · October 26, 2019, 6:27pm

Yes, scoreboard also has problems. Check the ranks 102, 115 and 127. @admin

anon31329220 · October 26, 2019, 6:40pm

My solution passed for first subtask in the contest only but why my submission is removed I got AC on first subtask in the contest I wasted my 2 hours on single problem only and Now that submission is removed why?? This rejudging criterion is ridiculous why people can’t bugless and fully tested problems for such a great contest rejudging after the contest tells us that sometime before you were right I joyed but later on when I saw the solution removed completely disgusting situation by codechef

vineetja · October 26, 2019, 6:41pm

I used same formula but didn’t get correct answer for subtask-1. Solution is here.

l_returns · October 26, 2019, 7:08pm

Make it rated for us at least @kingofnumbers and @jafarbadour.
I kept warning every 5-15 mins about this issue to you but you ignored me.
Now don’t just make it unrated.
You don’t even try submitting brute Force solutions ? Even after multiple comments.
Pinged you at 8:30. Issue could have been resolved.

realnimish · October 26, 2019, 7:10pm

Same problem here CodeChef: Practical coding for everyone . Don’t know why its failing. (Note: 0-based indexing used)

grg124 · October 26, 2019, 7:56pm

what is maximum rating in a single contest?

ssjgz · October 26, 2019, 8:12pm

275 points is the most your Rating can increase by in one contest, but I can’t find a good reference for it - this is the best I can find so far.

Edit:

Ah, this is better - the maximum value for the formula beginning with “The rating changes are capped” is 275.

l_returns · October 27, 2019, 2:14am

My rank is 45 now.

eulerkochy · October 27, 2019, 2:32am

Rank has been updated. But not the ratings. Probably, there would be recalculation of ratings, now that all the solutions for KTH97 has been rejudged.

eulerkochy · October 27, 2019, 2:40am

No reasons to believe otherwise, mate! As of now

eulerkochy · October 27, 2019, 2:53am

Bold move to assume I haven’t already! There has been no update from the co-ordinator/setter, and that’s the primary reason why I believe the contest won’t be unrated, and assuming that all of our ranks has been updated, there is a high chance of recalculation of ratings.

EDIT: cc is just messing around with our diwali celebrations. and to be fair enough, such situations are happening quite often in recent times.

sudhatks · October 28, 2019, 3:47pm

Is there no editorial for DDQUERY? I couldn’t find it.

sudhatks · October 30, 2019, 4:52pm

Editorial for DDQUERY, please. None of the participants got 100 points. So, I don’t know why it’s not published yet. Eagerly waiting.

pk301 · October 31, 2019, 9:52am

@teja349 can you please give a rough explanation for DDQUERY problem?

l_returns · October 31, 2019, 9:53am

I saw one segtree along with LCA solution.
LCA got subtask 1.
Now we need to optimize it with segtree