Invitation to CodeChef May Lunchtime 2020

We invite you to participate in CodeChef’s May Lunchtime, this Saturday, 30th May, from 7:30 pm to 10:30 pm IST

3 hours, 5 problems.

We will also be hosting live problem discussion sessions where our panelist, rajarshi_basu will discuss the Lunchtime problems. Find more details here.

Also, if you have some original and engaging problem ideas, and you’re interested in them being used in CodeChef’s contests, you can share them here.

Joining me on the problem setting panel are:

Prizes:

Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which they can claim cool CodeChef goodies. Know more here.

Good luck and have fun!

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A humble request , please make sure that test cases are strong enough so the brute force solution will not work :slight_smile: @admin

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This Line makes me happy. Looking forward to some great Problems and an awesome editorial by him.

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@mathemaniac
Editorials are also waiting for contest end to be posted :wink:

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Indeed !!

Reminder: The contest starts in 20 minutes.

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Tomorrow is an Indian Contest at Codeforces and today it’s almost an Indian Lunchtime at Codechef.

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@taran_1407 orz

Really good problems.
Would surely learn a lot. Thank you to the whole team.
We appreciate your efforts :slight_smile:

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What a good level of problems!! :clap:

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Problem TREE DIFFERENCE was same as this problem https://www.codechef.com/problems/CLOSEFAR . Could you please look into this as its solution is just a google search away. @admin

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The both problems have different constraints and TREEDIFF has only one type of query.

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No, it isn’t. The constraints are totally different(Mo’s might probably time out, I couldn’t find any solution of mo’s submitted/passed in this problem). Also the intended solutions are different.

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This one might work here https://codeforces.com/blog/entry/43230 with additional constraint that if number of distinct values is greater than max(A) then answer is 0. Also, constraints dont matter because values of array A are restricted upto 100.

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The editorials for all problems are posted and can be accessed via https://discuss.codechef.com/tag/ltime84

Hope you guys had a great contest!

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