2017 December Contest -- Final Results

This was our first contest of the 2017-2018 season. A total of 4489 distinct users logged into the contest during its 4-day span. A total of 3615 participants submitted at least one solution, hailing from 80 different countries:

 2399 USA  335 CHN   59 MYS   57 GEO   54 CAN   52 ROU   47 VNM
   45 RUS   41 FRA   41 BLR   40 IND   40 AUS   26 MEX   22 ARM
   21 UKR   20 KAZ   20 BRA   17 DEU   14 KOR   14 IRN   14 BGR
   12 KGZ   12 FIN    9 TWN    9 IDN    9 HRV    9 EST    9 CUB
    9 BGD    9 ARG    8 JPN    8 GRC    7 ZAF    7 SRB    7 GBR
    6 TKM    6 POL    6 NLD    5 TUR    5 THA    5 SYR    5 BIH
    4 SGP    4 MDA    4 HUN    3 TUN    3 TJK    3 NZL    3 ITA
    3 IRL    3 HKG    3 ESP    3 DOM    3 COL    2 SVN    2 SVK
    2 SIN    2 PRI    2 MKD    2 LTU    2 KZN    2 EGY    2 BEL
    2 AZE    1 SAR    1 ROK    1 PRT    1 PRC    1 NGN    1 NGA
    1 MYA    1 MXN    1 LVA    1 LKA    1 GER    1 DNK    1 CMR
    1 CHL    1 CHI    1 AUT
In total, there were 11324 graded submissions, broken down by language as follows:

 4334 Java
 3570 C++11
 1976 C++
  914 Python 3.4.0
  350 Python 2.7.6
  146 C
   34 Pascal

Below are the detailed results for each of the platinum, 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(s) you took.

USACO 2017 December Contest, Platinum

The platinum division had 501 total participants, of whom 355 were pre-college students. Results for top scorers are here. Congratulations to all of the top participants for their excellent results!

1

Standing Out from the Herd
View problem  |   Test data   |   Solution

2

Push a Box
View problem  |   Test data   |   Solution

3

Greedy Gift Takers
View problem  |   Test data   |   Solution

USACO 2017 December Contest, Gold

The gold division had 544 total participants, of whom 424 were pre-college students. All competitors who scored 750 or higher on this contest are automatically promoted to the platinum division. Detailed results for all those promoted are here.

1

A Pie for a Pie
View problem  |   Test data   |   Solution

2

Barn Painting
View problem  |   Test data   |   Solution

3

Haybale Feast
View problem  |   Test data   |   Solution

USACO 2017 December Contest, Silver

The silver division had 1419 total participants, of whom 1172 were pre-college students. All competitors who scored 750 or higher on this contest are automatically promoted to the gold division. Detailed results for all those promoted are here.

1

My Cow Ate My Homework
View problem  |   Test data   |   Solution

2

Milk Measurement
View problem  |   Test data   |   Solution

3

The Bovine Shuffle
View problem  |   Test data   |   Solution

USACO 2017 December Contest, Bronze

The bronze division had 2763 total participants, of whom 2295 were pre-college students. All competitors who scored 750 or higher on this contest are automatically promoted to the silver division. Detailed results for all those promoted are here.

1

Blocked Billboard
View problem  |   Test data   |   Solution

2

The Bovine Shuffle
View problem  |   Test data   |   Solution

3

Milk Measurement
View problem  |   Test data   |   Solution

Final Remarks

Our 2017-2018 season is off to a good start, with record-setting levels of participation and no technical glitches! As is common for the first contest of the season, many competitors earned perfect scores and were promoted to higher divisions.

One unhappy note: one of the reasons it takes so long to process results for these contests is due to the need to carefully examine cases of potential cheating, a substantial number of which occurred during this contest. We take academic integrity very seriously in our contests, and as per our rules, any user flagged for cheating earns a lifetime disqualification, and will either be barred from ever earning an invitation to our training camp (if from the USA) or potentially reported to the organizers of their national Olympiad (if not from the USA).

For those still waiting to achieve promotion, remember that 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, Nathan Pinsker, Travis Hance, Mark Chen, Matt Fontaine, Christopher Chang, Allen Chen, and Dhruv Rohatgi. 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: D.E. Shaw, Jump Trading, and Ansatz Capital.

We hope you will all join us for our next contest in January.

Happy coding!

- Brian Dean (bcdean@clemson.edu)
Director, USA Computing Olympiad
Associate Professor of Computer Science, Clemson University

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