USACO 2014 US Open Contest -- Final Results
The USACO 2014 US Open 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 1205 participants submitted at least one solution, hailing from 67 different countries:
536 USA 131 CHN 51 IRN 49 VNM 31 CAN 31 BLR 25 GEO
22 IDN 19 TUR 19 MEX 15 UKR 15 BRA 12 TKM 12 RUS
12 IND 10 TWN 10 KAZ 10 JPN 10 FRA 10 BGR 9 VEN
9 THA 9 BEL 9 ARM 8 KOR 8 BGD 7 ROU 7 MKD
7 DEU 7 AUS 6 SGP 6 FIN 5 ZAF 5 NLD 5 IRL
5 GRC 5 CUB 5 AZE 4 DOM 4 CZE 3 POL 3 LTU
3 EST 3 EGY 3 BIH 2 TUN 2 TJK 2 SYR 2 PER
2 MNG 2 GBR 2 CYP 2 AUT 1 SWE 1 SVN 1 SVK
1 SRB 1 SHN 1 PRT 1 NZL 1 MDA 1 ITA 1 ISL
1 HRV 1 HKG 1 DNK 1 ARG
The average participant submitted solutions for 1.6 problems. In total, there were 1925 graded submissions, broken down by language as follows:
1189 C++ 541 Java 110 Pascal 34 C 26 Python 3.2 25 Python 2.7.2
Gold Division Results
The Gold division had 366 total participants, of whom 287 were pre-college students.
The US Open problems proved to be quite challenging accross all divisions, with gold being no exception. Congratulations to our top pre-college competitors:
| Country | Grad | Name | Score |
|---|---|---|---|
| JPN | 2018 | Yuta Takaya | 867 |
| USA | 2016 | Demi Guo | 667 |
| TWN | 2015 | Brian Chen | 667 |
| USA | 2014 | Steven Hao | 633 |
| USA | 2015 | Andrew He | 600 |
| DNK | 2015 | Kevin Zivanovic | 567 |
| CHN | 2015 | Yuetong Wang | 567 |
| USA | 2015 | Scott Wu | 567 |
| CHN | 2015 | Cir Li | 533 |
| AUS | 2014 | Ray Li | 533 |
| USA | 2014 | Bill Cooperman | 533 |
Top observers were:
| Country | Name | Score |
|---|---|---|
| ZAF | Bruce Merry | 967 |
| HRV | Lovro Puzar | 833 |
| JPN | Uwi Tenpen | 633 |
| CAN | Jacob Plachta | 600 |
| DEU | Fabian Gundlach | 533 |
| RUS | Dmitry Gorbunov | 433 |
| ISL | Bjarki Agust Gudmundsson | 400 |
| FIN | Antti Laaksonen | 367 |
| VNM | Hai Hoang | 333 |
| RUS | Ivan Fefer | 267 |
| SVK | Jakub Safin | 267 |
| RUS | Gerald Agapov | 267 |
Silver Division Results
The Silver division had 333 total participants, of whom 281 were pre-college students.
Top pre-college participants in the silver division were:
| Country | Grad | Name | Score |
|---|---|---|---|
| CHN | 2016 | Md Wang | 900 |
| KAZ | 2016 | Nazarbek Altybay | 767 |
| USA | 2016 | Edward Lee | 733 |
| IRN | 2019 | Abtin Bateni | 700 |
| TUR | 2014 | Halil Ozan Akgül | 700 |
| JPN | 2015 | Ken Ogura | 667 |
| CHN | 2016 | Jahoo Yang | 667 |
| USA | 2016 | Selena Feng | 667 |
| GEO | 2016 | Dato Bejanishvili | 633 |
| USA | 2017 | Aaron Kaufer | 633 |
And the top observers in the silver division included:
| Country | Name | Score |
|---|---|---|
| RUS | Vitaly Demidenko | 1000 |
| CHN | Ce Jin | 867 |
| CHN | Zheye Deng | 833 |
| CHN | Qiwei Yu | 767 |
| USA | Evan Ye | 700 |
| CHN | Chao Zhang | 667 |
| IDN | Aufar Gilbran | 533 |
| VNM | Duc Thien Bui | 500 |
| VNM | Tuan Nguyen | 433 |
| BRA | Ivan Henrique Petrin | 400 |
All participants with scores at least 500 will be automatically promoted to the gold division for future contests.
Bronze Division Results
The Bronze division had 506 total participants, of whom 417 were pre-college students.
The bronze division was the only division in which we saw perfect scores among our pre-college students. Top students were:
| Country | Grad | Name | Score |
|---|---|---|---|
| RUS | 2016 | Vladislav Bidzilya | 1000 |
| TWN | 2014 | Hsu Chin-Chia | 1000 |
| CHN | 2015 | Shunyu Yao | 1000 |
| USA | 2015 | Aurick Zhou | 1000 |
| TUR | 2016 | Erdem Fuller | 1000 |
| CAN | 2014 | Alex Wen | 967 |
| GEO | 2016 | Nika Losaberidze | 900 |
| TWN | 2015 | Jerry Chang | 867 |
| UKR | 2016 | Slava Oheretny | 833 |
| IRN | 2015 | Armin Fallah | 833 |
Top observers were:
| Country | Name | Score |
|---|---|---|
| USA | Michael Kirsche | 1000 |
| CHN | Ball Qiu | 1000 |
| TWN | Kevin Yen | 1000 |
| KAZ | Pernekhan Utemuratov | 1000 |
| IND | And Bluer | 867 |
| PER | Luis Vasquez | 867 |
| USA | Susan Wang | 867 |
| USA | Chung-Wen Albert Tsao | 867 |
| BRA | Anderson Silva | 833 |
| CHN | Achilles Lee | 833 |
| CUB | Yairon CId Ruiz | 833 |
All participants with scores at least 500 will be automatically promoted to the silver division for future contests.
Final Remarks
As you might have surmised from the results, the 2014 US Open was an exceedingly challenging contest, more so than a typical USACO contest -- this was by design, as the US Open serves as our "national championship" contest, the grand finale to our 2013-2014 contest season, and as the contest has a slightly longer time limit. Across all divisions, very few contestants earned particularly high marks. Accordingly, cutoffs for promotion have been set rather generously to alllow as many students as possible to advance to the next division starting with the first contest of the 2014-2015 season.
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 (especially this one!) 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, Bruce Merry, Kalki Seksaria, Jacob Steinhardt, Jonathan Paulson, Richard Peng, and Allen Chen. 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 throughout the entire 2013-2014 season: IBM, Usenix, TwoSigma, and Jump Trading. I am thrilled to welcome two new sponsors to our family: Dropbox and D.E. Shaw -- two companies that recognize the value of supporting the development of top computing talent worldwide.
I am glad to see that many of our participants have steadily improved throughout the entire 2013-2014 season. We will be announcing finalists to attend our summer training camp soon. For those still working towards this goal, I challenge you to continue practicing over the summer, and I hope to see you again in the fall of our 2014-2015 season!
Happy coding!
- Brian Dean ([email protected])
Director, USA Computing Olympiad