The Qualification Round of the 2021 Facebook Hacker Cup is less than 48 hours away!

The round will begin on August 27th, 2021 at 10am PDT and will last for 72 hours (3 days). The contest can be found here.

Everyone who solves at least one problem correctly will advance to Round 1, which will take place on September 11th. Please note that all submission judgments will only be revealed after the round ends. More details about rules and other information can be found in the FAQ.

Registration will remain open on the contest page until the end of the Qualification Round. Once you've registered, you may wish to confirm that the information in your competition profile is up to date. In addition to choosing a Display Handle for yourself there, you may now also indicate which country you’d like to represent on scoreboards.

This year's contests will feature a new submission flow making it easier to download large input files. For each problem, you'll now download the full input in a password-protected zip file, and the 6-timer will only begin when you then request the password to access your file. You'll also be given the option to directly download the raw input file (as in past years) in case you have trouble with the zip file. Please see the “How do I submit my solution?” section of the FAQ for more details.

Last year’s increased prizes are making a return in the 2021 Hacker Cup season, including 2,000 t-shirts to be won and a $20,000 grand prize.

We wish you the best of luck, and hope that you enjoy the contest!