USACO December 2013 Contest -- Final Results

The USACO December 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 1912 participants submitted at least one solution, hailing from 73 different countries:

  812 USA  219 CHN  131 VNM   58 BLR   57 IRN   55 CAN   37 GEO
   31 MEX   27 MNG   27 DEU   24 RUS   23 KOR   23 ARM   21 KAZ
   20 IND   18 ROU   17 AUS   16 BRA   15 AZE   14 VEN   14 TUR
   14 BGR   13 LTU   12 TKM   12 SRB   12 HRV   12 FRA   11 THA
   11 POL   11 BGD   10 IDN    9 MKD    8 CUB    7 TWN    7 JPN
    7 ITA    7 GRC    6 ZAF    6 TJK    6 SGP    6 DOM    5 UKR
    5 LVA    4 EST    4 EGY    3 SYR    3 SVN    3 PER    3 NZL
    3 NLD    3 GBR    3 CZE    3 ARG    2 ISR    2 FIN    2 AUT
    1 VAT    1 TUN    1 SVK    1 PRT    1 MNE    1 MDA    1 ISL
    1 HKG    1 GIB    1 GHA    1 ESP    1 CYP    1 COL    1 BIH
    1 BEL    1 ASM    1 ABW

The average participant submitted solutions for 2.2 problems. In total, there were 4272 graded submissions, broken down by language as follows:

 2393 C++           
 1143 Java          
  469 Pascal        
  102 Python 2.7.2  
   83 C             
   82 Python 3.2    

Gold Division Results

Full Gold Results

The Gold division had 248 total participants, of whom 172 were pre-college students.

Congrats to the following 11 pre-college participants with perfect scores!

Country	Grad	Name	Score
VNM	2014	Nguyễn Quang Dũng	1000
USA	2014	Jerry Ma	1000
CHN	2014	Mingda Qiao	1000
CHN	2014	Lemon Xu	1000
USA	2014	Bill Cooperman	1000
ROU	2014	Andrei Heidelbacher	1000
SRB	2015	Marko Stankovic	1000
AUS	2015	Michael Chen	1000
CHN	2015	Xu Yinzhan	1000
USA	2015	Scott Wu	1000
USA	2016	Demi Guo	1000

Top observers in the gold division were:

Country	Name	Score
JPN	Uwi Tenpen	1000
VNM	Le Minh Hoang Hnue	1000
ZAF	Bruce Merry	1000
ARM	Albert Sahakyan	1000
RUS	Gerald Agapov	1000
RUS	Alexey Safronov	833
BGD	Nazmul Hasan	833
RUS	Dmitry Gorbunov	833
USA	Calvin Deng	800
RUS	Nikolay Kuznetsov	800

Silver Division Results

Full Silver Results

The Silver division had 373 total participants, of whom 297 were pre-college students.

We had quite a few perfect scores among our pre-college participants -- 17 of them! Congratulations to the following individuals:

Country	Grad	Name	Score
CHN	2015	Exia Cai	1000
USA	2015	Luke Liao	1000
IRN	2014	Reza Soltani	1000
GHA	2015	Xuanyuan Luo	1000
THA	2016	Theemathas Chirananthavat	1000
TWN	2015	Brian Chen	1000
BRA	2014	Mateus Bezrutchka	1000
HRV	2014	Mislav Bradac	1000
POL	2014	Michał Wiatrowski	1000
POL	2015	Marek Zbysiński	1000
SGP	2014	Ranald Lam	1000
RUS	2014	Aidar Sayranov	1000
BLR	2015	Alex Vistyazh	1000
KOR	2016	Seunghyun Joe	1000
HRV	2016	Domagoj Bradac	1000
THA	2014	Krittisak Chaiyakul	1000
THA	2015	Phoomraphee Luenam	1000

Top observers in the silver division were:

Country	Name	Score
CHN	Daniel Duan	1000
ZAF	Shaylan Lalloo	1000
DEU	Felix Bauckholt	1000
VNM	Van Hanh Pham	1000
NLD	Mathijs van de Nes	1000
USA	Bob Suffern	873
FIN	Matias Lahti	867
CHN	Yisong Wang	833
VNM	Hoàng Phú Nguyễn	833
KOR	Seunghyun Jo	833
BLR	Ilya	833

All participants with scores at least 800 will be automatically promoted to the gold division for future contests.

Bronze Division Results

Full Bronze Results

The Bronze division had 1291 total participants, of whom 1008 were pre-college students.

There were also quite a few perfect scores among the bronze pre-college participants:

Country	Grad	Name	Score
SYR	2014	Alex Abbas	1000
BLR	2014	Nikita Samsonov	1000
ZAF	2014	Robin Visser	1000
USA	2017	Ariadne Liu	1000
IRN	2015	Mamad Esi	1000
CHN	2014	Yang Tianlong	1000
CHN	2015	宇 陈	1000
IRN	2015	Navid Rahimidanesh	1000
VNM	2015	Thang Tran	1000
CHN	2015	Xiaotian Le	1000
USA	2015	Guy Blanc	1000
USA	2015	Elizabeth Wei	1000
USA	2014	Daniel Johnson	1000
USA	2014	Nima RD	1000
USA	2015	Daniel Ju	1000
AUS	2016	Declan McDonnell	1000
USA	2015	Zhixin Feng	1000
CHN	2015	Yufei Wang	1000
VNM	2015	NhaDinh Cao	1000
USA	2015	Francis Gerard	1000
USA	2016	Theodore Katz	1000
ROU	2016	Mihail Jianu	1000
RUS	2014	Nikita Podguzov	1000
TUR	2016	Yunus Emre Inci	1000
DEU	2016	Viktor Yuschuk	1000
POL	2016	Tomek Kościuszko	1000
CHN	2014	Wenzhang Cheng	1000
USA	2015	Jonathan Roche	1000
CHN	2015	Xinjian Yu	1000
IRN	2015	Ali Haghani	1000

Top observers in the bronze division included:

Country	Name	Score
CHN	Bin Li	1000
NZL	Ryan Smith	1000
CHN	Chu Wei	1000
SRB	Dragan Markovic	1000
FRA	Alexis Comte	1000
CAN	Ted Ying	1000
RUS	Igor Pyshkin	1000
BGD	Mohammad Samiul Islam	1000
ARM	Narek Hovsepyan	1000
VNM	Loc Duc	933
CAN	Martin Mika	933

All participants with scores at least 800 will be automatically promoted to the silver division for future contests.

Final Remarks

Another successful contest! Score distributions in all three divisions look quite reasonable, with many participants earning reasonable amounts of points, but only a small handful achieving perfect or nearly-perfect scores. Promotion cutoffs were a bit more strict with this contest, requiring bronze and silver students to make good progress on all three problems in order to earn promotion.

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, Nathan Pinsker, Kalki Seksaria, Fatih Gelgi, Bruce Merry, Travis Hance, and Richard Peng. 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 look forward to seeing everyone again in early 2014 for our January contest.

Happy coding!

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