# Extremely unbalanced COOK OFF

Does codechef really wants to decrease ratings? Div 2 1st problem has more than 2k+ submissions. Was quite an easy question. What about question 2,3 (leaving the others). Less than 100 submissions and for 3rd less than 60. It is a balanced contest? Atleast 500 should solve the 2nd question. I think problem setters should see to it asap.

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Those were easy problems btw, itâ€™s a weird thing that many of Div 2 people could not solve them.

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Can you please tell me step by step approach of XORIT in lucid manner? Tried that question for an hour but couldnâ€™t make it.
What I know is if the number N is a power of 2 then B= -1, if N is odd (N%2==1) B= N-1(always),
if N= 6, 10, 14, 18, 22â€¦ B= N-2, if N= 12, 20, 28, 36â€¦ B= N-4(always)
However there is no implementation from here!
Iâ€™d be really grateful if you can share your approach of what made you say that XORIT was an â€śeasy problemâ€ť. Thanks.

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yes,codechef just gave so much rating for people even if they didnt do so well in previous contestsâ€¦hence making community more weakerâ€¦but still people will get raise even if they donâ€™t solve muchâ€¦thats the irony

Stop this unnecessary rant dude. Whatâ€™s up with you downplaying others anyway? You had made a similar inquiry month back: Why codechef ratings are so easy
and got the answer for it. Just because you did well in this cook-off doesnâ€™t mean that you go around in every comment section and spew this rhetoric onslaught every here and there.

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i dont want to insult or demotivate anyoneâ€¦
i am just trying to expose the reality so that codechef changes and the community gets better â€¦i wish someone with higher rating complain about these cookoffsâ€¦but i hope to see a change in cookoffs and rating system

Actually, the first step was to realise that B would be N with the least significant set bit as 0, and for powers of two, since B turns out to be 0, we have B = -1. Next you should realise that it is impossible to loop from L to R to find the highest power of two which divides the number. Think what you can do

Yes . Its obvious and iâ€™m not surprised at all . There are several unbalanced contests in codechef and this is another one . Thatâ€™s it

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Exactly, that was really unbalanced one.After solving 1st question in less than 10 minutes i got stuck in 2nd and 3rd questions for 3 hours but unable to solve them.

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bro I saw your codechef profile, you improved very well when compared to September long challenge, can I know what and where did you practice in between September to December to do well in coding

Donâ€™t worry bro. Similar situation here. And I think there will be many like us as this time contest was actually an unbalanced one.

Long answer short, I have recently completed Data Structures and Algos course in my college XD
The longer answer is that what I earlier thought was that I can do everything without having notebooks and stuff, but only recently did I realise that those are necessary. Also, I am doing a lot of practice these days, so that might have been a thing. For any more specific queries I am happy to help :â€™)

where are you doing the practice questions(website)?

I would recommend codeforces