USACO February 2013 Contest -- Final Results

The USACO February 2013 contest featured algorithmic programming problems covering a wide range of techniques and levels of difficulty.

Click here to see the contest problems and official solutions, or to practice re-submitting solutions.

A total of 1122 participants submitted at least one solution, hailing from 64 different countries:

 489 USA  62 BLR  51 CHN  32 IRN  31 VNM  30 CAN  25 TUR
  21 RUS  20 KAZ  17 ITA  17 ARM  16 MYS  16 GEO  16 BGR
  14 VEN  14 KOR  13 MEX  13 IND  12 ROU  12 DEU  11 CUB
  10 UKR   9 TKM   9 POL   9 MKD   9 AUS   8 TJK   8 GRC
   7 SRB   7 LTU   7 IDN   6 JPN   6 GBR   6 DOM   6 COL
   6 BGD   5 ZAF   5 NLD   5 LVA   5 FRA   5 AZE   4 YUG
   3 TWN   3 THA   3 SVK   3 SGP   3 ISR   3 HRV   3 EST
   2 MDA   2 HKG   2 ESP   2 CYP   2 BRA   2 BIH   2 BEL
   2 ARG   1 ZWE   1 RSA   1 MDG   1 HUN   1 CZE   1 BDI
   1 AUT

The average participant submitted solutions for 2.5 problems. In total, there were 2808 graded submissions, broken down by language as follows:

1696 C++
 768 Java
 243 Pascal
  61 Python
  38 C

Gold Division Results

The Gold division had 211 total participants, of whom 170 were pre-college students.

Full Gold Results

We had some fantastic results this time in the gold division, with 12 total perfect scores (9 in the pre-college category, and 3 observers). Perfect scores in the pre-college category were:

Country	Grad	Name	Score
KOR	2015	Seokhwan Choi	1000
USA	2015	Andrew He	1000
RUS	2014	Nikolay Kalinin	1000
VNM	2014	Nguyễn Quang Dũng	1000
LVA	2013	Ojārs Vilmārs Ratnieks	1000
USA	2014	Joshua Brakensiek	1000
USA	2015	Scott Wu	1000
USA	2014	Steven Hao	1000
USA	2013	Ray Li	1000

Perfect scores in the observer group included:

Country	Name	Score
NLD	Josse Dobben	1000
GBR	Robin Lee	1000
UKR	Yaroslav Tverdokhlib	1000

Congratulations to these and all other high-scoring participants!

Silver Division Results

The silver division had 232 total participants, of whom 193 were pre-college students.

Full Silver Results

Scores in the silver division were also quite impressive, with 6 perfect pre-college scores:

Country	Grad	Name	Score
VNM	2013	Anh Nguyễn Tuấn	1000
TWN	2013	Robert Huang	1000
MKD	2015	Vasil Kuzevski	1000
RUS	2013	Artem Rakhov	1000
POL	2014	Jarosław Dzikowski	1000
MKD	2015	Kliment Serafimov	1000

and also 5 perfect observers:

Country	Name	Score
COL	Alejandro Alejandro	1000
CHN	Yang Cao	1000
USA	Jason Li	1000
ROU	George Marcus	1000
JPN	Minoru Fujita	1000

All participants with scores at least 700 will be automatically promoted to the gold division for future contests.

Bronze Division Results

A total of 686 participants competed in the bronze division, 564 of them pre-college students.

Full Bronze Results

The bronze contest this time around proved to be much more approachable than in the January contest. Congratulations to the following 33 students achieving perfect scores in the pre-college group!

Country	Grad	Name	Score
KOR	2016	수찬 박	1000
TJK	2013	Ibrohim Jamshed	1000
GRC	2014	Jeffrey Tobin	1000
USA	2015	Yang Liu	1000
DEU	2013	Lucas Elbert	1000
USA	2013	Colin Wei	1000
KOR	2015	Taeho Gwon	1000
CHN	2015	Steven Du	1000
POL	2017	Paweł Burzyński	1000
JPN	2013	Kent Nikaido	1000
TUR	2015	Ikbal Kazar	1000
MYS	2014	Si Wei How	1000
CHN	2014	Nasri D	1000
IRN	2013	Mohammad Amin Khashkhashi Moghaddam	1000
USA	2018	Dhruv Rohatgi	1000
USA	2014	Paul Cruz	1000
USA	2015	Brice Huang	1000
ROU	2014	Radu Szasz	1000
BLR	2014	Egor Kazachenko	1000
ARM	2013	Karen Hambardzumyan	1000
ROU	2014	Tudor Tiplea	1000
IRN	2015	Kiarash Korki	1000
USA	2013	Jeffrey Yuan	1000
MYS	2013	SiYu How	1000
IRN	2014	Pedram Hashemi	1000
USA	2018	Nicholas Sun	1000
USA	2016	Michael Colavita	1000
USA	2016	Sean Shi	1000
RUS	2013	Edvard Davtyan	1000
RUS	2014	Maxim Gusarov	1000
RUS	2013	Ilya Peresadin	1000
RUS	2015	Igor Kudryashov	1000
BLR	2013	Artyom Kazak	1000

Also a round of congratulations to the observers with perfect scores:

Country	Name	Score
CHN	Yilun Wu	1000
RUS	Alexey Safronov	1000
NLD	Raymond van Bommel	1000
MEX	Ignacio Gutierrez	1000
USA	Weixin Guo	1000
NLD	Mathijs van de Nes	1000
BLR	Yanush Piskevich	1000
IRN	Ali Pournaghi	1000
CHN	Iru Cai	1000
KOR	Joon Young Seo	1000
RUS	Nikita Durynin	1000
CAN	Lawson He	1000

All participants with scores at least 850 will be automatically promoted to the silver division for future contests.

Final Remarks

With slightly higher participation than the January contest, everything seems to have run smoothly with the February contest. Score distributions were quite reasonable, and I was especially glad to see that the level of difficulty in bronze was back to a more reasonable state, after two very challenging bronze contests in December and January. Many participants are still being promoted to higher divisions. For those not yet promoted, remember that the more practice you get, the better your algorithmic coding skills will become -- please keep at it! 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. To help you fix any bugs in your code, you can now re-submit your solutions and get feedback from the judging server using "analysis mode".

A large number of people contribute towards the quality and success of USACO contests. Those who helped with this contest include Mark Gordon, Richard Peng, Travis Hance, Bruce Merry, Fatih Gelgi, Jonathan Paulson, Yan Gu, and Kalki Seksaria. Thanks also to our translators and to Clemson CCIT for providing our contest infrastructure. Finally, we are grateful to the USACO sponsors for their generous support: IBM, Usenix, TwoSigma, and Jump Trading.

We hope to see everyone again soon for the March contest -- just one more contest to go before the U.S. Open!

Happy coding!

- Brian Dean ([email protected])
Director, USA Computing Olympiad