Hello CodeForces Community!

With the preliminary rounds of IOI fast approaching, it is time to crack your knuckles and start preparing for it. To help you with your preparations, we have September Lunchtime 2016 CodeChef September Lunchtime coming up for you. Set by me and tested by CherryTree (Sergey Kulik) the contest has four brain-teasing problems which will make your weekend thrilling.

Joining me on the problem setting panel are:

• Problem Setter: mgch (Misha Chorniy)
• Problem Tester and Russian Translator: CherryTree (Sergey Kulik)
• Editorialist: pkacprzak (Pawel Kacprzak)
• Mandarin Translator: huzecong (Hu Zecong)
• Vietnamese Translator: VNOI Team
• Contest Admin PraveenDhinwa (Praveen Dhinwa)

Hope you will enjoy solving them. Please give your feedbacks on the problem set in the comments below after the contest.

Please find the rest of the details about the contest below.

Time: 24th September 2016 (1930 hrs) to 24th September 2016 (2230 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/LTIME40

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 school students each from Global and Indian category will get CodeChef laddus, with which the winners can claim cool CodeChef goodies. Know more here: https://www.codechef.com/laddu. (For those who have not yet got their previous winning, please send an email to winners@codechef.com).

Good Luck! Hope to see you participating!!