USACO February 2015 Contest -- Final Results
This was the third contest of our 2014-2015 contest season, the final contest before the US Open.
A total of 1884 participants submitted at least one solution, hailing from 69 different countries:
814 USA 135 CHN 71 IRN 60 VNM 60 GEO 55 BLR 49 CAN 43 BGD 38 ROU 38 BGR 35 KAZ 33 IND 32 SRB 29 TUR 27 RUS 20 DEU 20 ARM 17 KOR 16 TKM 16 TJK 16 AUS 14 UKR 14 MEX 13 HRV 12 JPN 12 FRA 11 TUN 11 COL 10 ZAF 10 CUB 9 MKD 9 GRC 9 EGY 8 NLD 8 GBR 8 FIN 7 POL 6 ISR 6 HUN 6 BEL 5 LTU 5 CZE 5 BIH 4 THA 4 SGP 4 IDN 4 EST 3 AUT 3 VEN 3 SYR 3 NZL 3 MYS 3 MDA 3 BRA 2 ALB 2 TWN 2 LVA 2 ITA 2 ARG 1 CHE 1 AZE 1 SVK 1 MNG 1 LUX 1 KGZ 1 IRL 1 ETH 1 ESP 1 CYP
The average participant submitted solutions for 2.2 problems. In total, there were 4152 graded submissions, broken down by language as follows:
1722 C++ 1120 Java 841 C++11 275 Pascal 74 Python 2.7.6 70 C 45 Python 3.4.0
Below are the detailed results for each of the gold, silver, and bronze contests. You will also find solutions and test data for each problem, and by clicking on any problem you can practice re-submitting solutions in "analysis mode". If you are logged in, you will also see your own specific results below alongside the contest you took.
USACO 2015 February Contest, Gold
The Gold division had 391 total participants, of whom 291 were pre-college students. As you can see from the score distribution (with only 6 perfect scores!), this was by far the toughest gold contest of the year:
Detailed results for all gold participants are here.
USACO 2015 February Contest, Silver
The Silver division had 547 total participants, of whom 454 were pre-college students. The overall distribution for silver looked quite reasonable:
All competitors who scored 650 or higher on this contest are automatically promoted to the gold division -- congratulations to you all on your strong results! Detailed results for those promoted are here.
USACO 2015 February Contest, Bronze
The Bronze division had 946 total participants, of whom 741 were pre-college students. We saw a wide range of scores from the bronze participants this time, including quite a few very high scores:
All competitors who scored 650 or higher on this contest are automatically promoted to the silver division -- to all who were promoted, congratulations! Detailed results for those promoted are here.
This was one of the more challenging gold contests we have given in recent history; silver and bronze were a bit more reasonable in terms of score distributions. Technically, this was one of the smoothest contests yet. The new grading platform seems to have reached a stable point with no issues reported this contest, and there were even hardly any clarification requests. I'm happy to see many students in bronze and silver being promoted -- and I wish all of you luck when you take the US Open in about a month!
USACO contests are designed to challenge even the very best students, and it can take a good deal of hard work to excel at them. Remember that the more practice you get, the better your algorithmic coding skills will become! To help you fix any bugs in your code, you are encouraged to consult the official solutions above and to make use of "analysis mode" to re-submit improved versions of your solutions.
A large number of people contribute towards the quality and success of USACO contests. Those who helped with this contest include Mark Gordon, Ben Cousins, Alex Yang, Richard Peng, Jonathan Paulson, Yinzhan Xu, and Nick (Huaiyu) Wu. Thanks also to Amy Quispe for helping to maintain our social media presence (Facebook: https://www.facebook.com/UsacoContests, Twitter: (https://twitter.com/UsacoContests), our translators for allowing us to offer this contest in five additional languages, to Clemson CCIT for providing our main contest server, and to our sponsors for their generous support: Usenix, Jump Trading, Dropbox, and D.E. Shaw.
We look forward to seeing everyone again soon for the US Open, our national championship contest!
- Brian Dean (email@example.com)
Director, USA Computing Olympiad
Associate Professor of Computer Science, Clemson University