Tired of writing AC solutions? We've got you covered! This contest turns the usual format on its head. You'll be given problems and their buggy code submissions. Your job will be to figure out a test case where the buggy solution fails.

We are proud to invite you to DeCode 2021, as a part of Threads, Felicity IIIT Hyderabad! We have prizes for top three GLOBAL as well as top three INDIAN participants.

Date and Time: March 1st, 2100-2330 IST
Contest Link: CodeChef DGTC2021
Register for prizes here: Felicity website


You will have nine problems and two and a half hours to solve them. The problems are a good mix for all difficulty levels, from international grandmasters to pupil. We have some very hard problems, and some very easy too, and everything in between.

The rules and prizes have been announced on the contest page.

There's a good mix of logically enthralling bugs, and bugs that make you go "Dude just how? :O", so you'll have tons of entertainment throughout the contest.

Thanks to the setters: ltc.groverkss, amul_agrawal, kjain1810, fangahawk, akcube, and myself for setting amazing problems. And thanks to the testers: madlad, aditya.verma, ninja_28, akshat_goyal, Zshan and oreos, for debugging our contest in beta stage (inception?!).

We'll post an editorial in this thread after the contest is over. We hope you'll enjoy it!