Hello CodeForces Community!

Chef has served 10 exotic dishes in October Long Challenge. He would like you to take part in the competition and taste all the dishes. So note down the details and be there.

Joining me on the problem setting panel, we have:

• Problem Authors: Berezin (Dmytro Berezin), PraveenDhinwa (Praveen Dhinwa), altruist (Denis Anischenko), adkroxx (Adarsh Kumar), kingofbugs (Hruday Pabbisetty), kingofnumbers (Hasan Jaddouh)
• Problem Tester: Alex_2oo8 (Alexey Zayakin)
• Admin: kingofnumbers (Hasan Jaddouh)
• Language Verifier: Priyank Jaini
• Russian Translator: CherryTree (Sergey Kulik)
• Mandarin Translator: huzecong (Hu Zecong)
• Vietnamese Translator: Team VNOI

I hope you will enjoy solving the problems. Please give your feedback on the problem set in the comments below after the contest.

Contest Details:

Time: 6th October 2017 (1500 hrs) to 16th October 2017 (1500 hrs). (Indian Standard Time — +5:30 GMT) — Check your timezone.

Details: https://www.codechef.com/OCT17

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 global and top 20 Indian winners get 300 Laddus each, 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!