Greetings Codeforces community!

CodeChef’s May Lunchtime sponsored by ShareChat is just around the corner and you are all invited to participate. This is not only an opportunity to get some practice and improve your coding skills, but also a chance to improve your rating!

Team CodeChef is also seeking problem ideas for our upcoming contests! If you think you have an idea that will make for an exciting contest problem, then send it to us using this form: https://www.codechef.com/problemsetting/new-ideas. Come and take your first step towards becoming a CodeChef problem setter!

ShareChat — India’s fastest growing social network is inviting participants of the Lunchtime to come apply for exciting work opportunities. Job opportunities are open to programmers across the world and internship opportunities are exclusively aimed at final year B.Tech students who have already been placed and looking forward to gaining startup experience. Visit the contest page for more details.

I hope you will join your fellow programmers and enjoy the contest problems. Joining me on the problem setting panel are:

• Setters: Slow_But_Determined (Abdullah Aslam), Vivek1998299 (Vivek Chauhan)
• Tester: Deemo (Mohammad Nematollahi)
• Admin: kingofnumbers (Hasan Jaddouh)
• Editorialist: taran_1407 (Taranpreet Singh)
• Statement Verifier: Xellos (Jakub Safin)
• Mandarin Translator: huzecong (Hu Zecong)
• Vietnamese Translator: Team VNOI
• Russian Translator: Mediocrity (Fedor Korobeinikov)
• Bengali Translator: solaimanope (Mohammad Solaiman)
• Hindi Translator: Akash Shrivastava

Contest Details:

• Start Date & Time: 25th May 2019 (1930 hrs) to 25th May 2019 (2230 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone
• Contest link: https://www.codechef.com/LTIME72
• Registration: You just need to have a CodeChef handle to participate. For all those, who are interested and do not have a CodeChef handle, are requested to register in order to participate.
• Prizes: Top 10 Indian and top 10 Global school students from ranklist will receive certificates and CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here: https://discuss.codechef.com/t/how-do-i-win-a-codechef-goodie/7344. (For those who have not yet got their previous winning, please send an email to [email protected])

Good Luck!

Hope to see you participating!!

Happy Programming!!

UPD: Unfortunately the contest is going to be unrated due to server issues.

UPD2: Congratulations to the top 3!!

DIV 1

1. isaf27
2. uwi
3. amnesiac_dusk

DIV 2

1. Geothermal
2. Sugar_fan
3. CSHwang

UPD3: The editorials of first 4 problems are ready and will be posted soon. The editorials of other 3 problems will be posted tomorrow. Meanwhile, you can go through the Author's notes for those problems here.

UPD4: All editorials have been posted.

UPDATE:

I've uploaded the code that I used to generate this on Github, in case someone needs to generate something similar:

Codeforces Team Rating Calculator

The regional round has ended and here's the final Ranklist:

https://www.codechef.com/public/rankings/ACM18GWR

Inspired by the list of teams going to Kharagpur regionals, I decided to make one for Gwalior/Pune regionals. The list contains all the teams from the official Gwalior website. If you know the usernames of members of any of the teams. Please update the excel file:

HERE

Team rating calculation has been done according to the official Codeforces team rating calculation formula.

The table will be updated with details from the excel file every 6 hours or so.

Last Updated: 10 pm, 12th December IST

As it is ICPC practice season, we've been doing a lot virtual contests from gym. So, Here's a script that I made to sort problems of a contest in the order of number of submissions (which often translates to difficulty). This would help to choose a contest with smooth gradient and also quickly identify the next problem that should be solved during the contest.

INSTALLATION STEPS

• Install Tampermonkey for Chrome/ Greasemonkey for Firefox.
• Install the script from here.

USAGE

Go to any contest page such as:

http://codeforces.me/gym/101954

The problem list should get sorted automatically based on the number of submissions.

I usually write:

'#define N 1000000

vector adj[N];

But when I run it locally, I get segmentation fault due to stack size being too small, so I end up reducing N to something like 10000 and forget to change it back again before submitting, causing unnecessary penalties.

So is there anyway to permanently increase stack size in ubuntu?

g++ -Wl,--stack=268435456 file.cpp works in Windows.

ulimit -s unlimited only increases stack size for the specific terminal

UPD:

Thanks a lot for your replies, I ended up spilling water on my laptop :(

I'll try the suggestions when (if?) My laptop gets dried.