The Round 3 of the Algorithm Competition of 2021 Topcoder Open is happening! It will take place on Saturday, July 8 at 07:00 UTC -4.

Please note that you must register for this round in the Arena. Registration is now open for the round in the Arena or Applet and will close 5 minutes before the match begins, so make sure that you are all ready to go. Click here to what time it starts in your area.

There will be a parallel rated round for those who are not eligible to compete.

Members eligible to compete in the Parallel Round include:
- Who did not qualify for Round 3
- Qualified for Round 4 or TCO21 Algorithm Finals from Online Stages 1, 2, 3 and 4

Don’t know how to compete in Topcoder Algorithm Competitions?
Check out this guide to successfully compete in an algorithm match.

You can compete using:

• Topcoder Java Applet - You can refer to this guide here to set up the applet. (Note that those who have Java 8 installed on their machine will see a security issue — You will have to add Topcoder in security exceptions in Java Control Panel. Please refer to the details in the guide.)
• Topcoder Web Arena(Beta) - Please watch this video for step by step guide

Some Important Links Match Results (match results, rating changes, challenges, individual test case results), Problem Archive, Problem Writing, Algorithm Rankings, Editorials and Older Editorials(SRM 710 and before),

Best of luck to you in the Arena!

- The Topcoder Community team