2019 December Contest -- Final Results

The 2019 December contest featured algorithmic programming problems covering a wide range of techniques and levels of difficulty.

A total of 7698 distinct users logged into the contest during its 4-day span. A total of 6545 participants (a substantial jump from last year!) submitted at least one solution, hailing from 76 different countries:

 3508 USA 1615 CHN  205 KOR  142 CAN   84 ROU   83 MYS   73 BLR
   68 RUS   67 VNM   62 IND   58 GEO   38 SGP   31 FRA   29 IRN
   26 POL   26 KAZ   25 MEX   24 UKR   22 ARM   21 AUS   19 SLV
   19 GBR   19 CUB   18 HRV   18 DEU   16 TWN   16 MNG   15 TUR
   15 BGD   14 SRB   13 BRA   12 EGY   10 JPN    9 SAU    9 HKG
    8 IDN    8 COL    7 TUN    7 LTU    6 THA    6 SYR    6 MAR
    6 EST    5 NLD    4 ZAF    4 TJK    4 ISR    4 BGR    3 NGA
    3 ITA    3 BEL    2 TKM    2 PRT    2 HUN    2 GRC    2 CYP
    2 AZE    2 ARG    1 ZWE    1 WSM    1 UZB    1 PHL    1 PER
    1 NZL    1 NOR    1 NER    1 MDA    1 KGZ    1 HTI    1 GIN
    1 FIN    1 ECU    1 DOM    1 CMR    1 BIH    1 BHS
In total, there were 20319 graded submissions, broken down by language as follows:

 7138 C++11
 5261 Java
 4705 C++
 2805 Python 3.4.0
  299 Python 2.7.6
  103 C
    8 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 2019 December Contest, Platinum

The platinum division had 493 total participants, of whom 317 were pre-college students. Results for top scorers are here. Congratulations to all of these high-scoring participants for their excellent results!

1

Greedy Pie Eaters
View problem  |   Test data   |   Solution

2

Bessie's Snow Cow
View problem  |   Test data   |   Solution

3

Tree Depth
View problem  |   Test data   |   Solution

USACO 2019 December Contest, Gold

The gold division had 900 total participants, of whom 694 were pre-college students. All competitors who scored 800 or higher on this contest are automatically promoted to the platinum division. Detailed results for all those promoted are here.

1

Milk Pumping
View problem  |   Test data   |   Solution

2

Milk Visits
View problem  |   Test data   |   Solution

3

Moortal Cowmbat
View problem  |   Test data   |   Solution

USACO 2019 December Contest, Silver

The silver division had 2299 total participants, of whom 1715 were pre-college students. All competitors who scored 650 or higher on this contest are automatically promoted to the gold division. Detailed results for all those promoted are here.

1

MooBuzz
View problem  |   Test data   |   Solution

2

Meetings
View problem  |   Test data   |   Solution

3

Milk Visits
View problem  |   Test data   |   Solution

USACO 2019 December Contest, Bronze

The bronze division had 5831 total participants, of whom 4442 were pre-college students. All competitors who scored 800 or higher on this contest are automatically promoted to the silver division. Detailed results for all those promoted are here.

1

Cow Gymnastics
View problem  |   Test data   |   Solution

2

Where Am I?
View problem  |   Test data   |   Solution

3

Livestock Lineup
View problem  |   Test data   |   Solution

Final Remarks

What an awesome start to the season! Our participation numbers jumped by a substantial amount from last year, which is great to see. As is typical for the first contest of the season, we saw a large number of promotions across all 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".

Many people contribute towards the quality and success of USACO contests. Those who helped with this contest include Benjamin Qi, Spencer Compton, Mark Gordon, Nick Wu, Eric Wei, Dhruv Rohatgi, Michael Cao, and Yinzhan Xu. 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: TwoSigma, D.E. Shaw, and Ansatz Trading.

We look forward to seeing everyone again for the 2020 January contest.

Happy coding!

- Brian Dean ([email protected])
Professor of Computer Science, Clemson University
Director, USACO