A lot of, if not all, of the SGU problems come from old contests, though the SGU problem statements themselves often do not have the contest attribution associated with them. For example, problems 542 through 553 are the 2012 NEERC Southern Subregional, but that attribution is not present in the problem statements (as of the time of this post). Compare this with problems 201 through 208, which are stated as being part of a Petrozavodsk training contest (specifically ASC 2, though that is not explicitly mentioned in the statements).

I'd like to assemble/crowdsource a comprehensive mapping of SGU problem IDs to the contests where the problems were originally hosted, and additionally links to them in the Codeforces gyms if they're hosted there. Does anyone have this mapping? I'm curious if the admins or anyone familiar with how the SGU problems were sourced to begin with can help out here, otherwise this can be easily crowdsourced.

• 193-200: http://codeforces.me/gym/100199 (ASC 1)
• 201-208: http://codeforces.me/gym/100197 (ASC 2)
• 209-217: http://codeforces.me/gym/100198 (ASC 3)
• 296-305: http://codeforces.me/gym/100765 (NEERC Southern Subregional 2006)
• 306-314: http://codeforces.me/gym/101365 (Petr Mitrichev Contest 1)
• 326-335: http://codeforces.me/gym/101366 (Petr Mitrichev Contest 2)
• 346-357: http://codeforces.me/gym/101503 (NEERC Southern Subregional 2007)
• 368-379: http://codeforces.me/gym/101591 (Saratov SU Contest, Summer Petrozavodsk 2008)
• 392-402: http://codeforces.me/gym/101504 (NEERC Southern Subregional 2008)
• 414-422: http://codeforces.me/gym/101367 (Petr Mitrichev Contest 3)
• 423-432: http://codeforces.me/gym/101368 (Petr Mitrichev Contest 4)
• 443-452: http://codeforces.me/gym/100837 (Japanese Contest 3, Summer Petrozavodsk 2009)
• 453-463: http://codeforces.me/gym/101252 (NEERC Southern Subregional 2009)
• 464-473: http://codeforces.me/gym/100206 (Goryinyich Challenge X)
• 474-484: http://codeforces.me/gym/100761 (Halloween Contest 2009, problems A-K only)
• 485-496: http://codeforces.me/gym/101411 (NEERC Western Subregional 2009)
• 497-507: http://codeforces.me/gym/101370 (Petr Mitrichev Contest 5)
• 508-517: http://codeforces.me/gym/101371 (Petr Mitrichev Contest 6)
• 518-529: http://codeforces.me/gym/101246 (NEERC Southern Subregional 2010)
• 530-541: http://codeforces.me/gym/100151 (NEERC Southern Subregional 2011)
• 542-553: http://codeforces.me/gym/100109 (NEERC Southern Subregional 2012)

Hi all,

Inspired by stevenkplus and scott_wu, I will be hosting a livestream on Sunday, June 3rd, at 10 AM PDT of my virtual participation in Codeforces Round 486. I'll be streaming at https://www.twitch.tv/xiaowuc1 for approximately two hours. Hope to see you there!

Edit 1: This stream is going live in under an hour! I'll try to start it a few minutes before 10 AM to make sure that audio and video are working properly, with the actual solving starting no earlier than 10 AM.

Hi all,

The US Open and final contest of the 2017-2018 USACO season will be running from Friday, March 23rd to Monday, March 26th.

As always, please wait until the contest is over for all competitors before discussing any specifics of the contest here.

Update: The contest is now live! Good luck to all competing!

Hi all,

The third contest of the 2017-2018 USACO season will be running from Friday, February 23rd to Monday, February 26th. This will be the last contest before the US Open, scheduled for March 23rd to March 26th.

Please wait until the contest is over for everyone before discussing problems here.

Hi all,

The second contest of the 2017-2018 USACO season will be running from Friday, January 19th to Monday, January 22nd.

Please wait until the contest is over for everyone before discussing problems here.

Update: The contest is now live!

Hi all,

The first contest of the 2017-2018 USACO season will be running from December 15th to December 18th. Good luck to everyone as we start our season! Please wait until the contest is over for everyone before discussing problems here.

Update 1: The contest is now live!

Hi all,

The third contest of the 2016-2017 USACO season will be open from February 10th to February 13th. This will be our last contest before the US Open. Feel free to discuss the problems here after the contest is over!