## Quick Facts and Figures

# 172

### competitors

# $7000+

### worth of prizes awarded

# 10

### unique challenges

# 15

### majors represented

# 19

### prize winners

# 6

### wonderful contributors

#### Feel free to check out this infographic on last year’s competition for more details on participation rates, breakdown by major, etc.

## Prize Winners

#### A comprehensive list of standings and point-breakdowns can be found here. Summary of standings below:

### Top 5 Overall

####
- Calvin Deng (MAT, Grad Student): 110/155
- Antonio Molina-Lovett (COS, Grad Student): 95/155
- Yuping Luo (COS, Grad Student) and Xiaoqi Chen (COS, Grad Student): 91/155
- Seyoon Ragavan (MAT ’21) and Lucas Salvador (COS, Grad Student): 65/155
- Kai Zheng (MAT ’21) and Justin Yan (COS ’21): 42/155

### Undergraduate Top 5

####
- Kai Zheng (MAT ’21) and Justin Yan (COS ’21): 42/155
- Kiril Atasanov Bangachev (MAT ’22) and Rahul Saha (COS ’22): 35/155
- Allison Qi (MAT ’24) and Michael Tang (COS ’24): 35/155
- Brendan Zelikman (COS ’23) and Kevin Huang (COS ’23): 35/155
- Christopher Ye (MAT ’21) and Byron Chin (COS ’21): 34/155

### Miscellaneous Prize Winners

####
**Fastest Solution to Any Problem**: Devon Ulrich (COS ’23) and Andrew Chen (COS ’23)
**Best Codebreakers**: Alex Valtchanov (COS ’22) and Brandon Huynh (ORF ’22)
**Best Freshman/Sophomore Team**: Allison Qi (MAT ’24) and Michael Tang (COS ’24)
**Codegolf (Fewest Average Number of Characters)**: Kimberly Ding (COS ’21) and William Li (COS ’21)
**Most Inquisitive**: Allison Chou (MOL ’23) and Ellen Su (CBE ’23)

**Fastest Solution to Any Problem**: Devon Ulrich (COS ’23) and Andrew Chen (COS ’23)**Best Codebreakers**: Alex Valtchanov (COS ’22) and Brandon Huynh (ORF ’22)**Best Freshman/Sophomore Team**: Allison Qi (MAT ’24) and Michael Tang (COS ’24)**Codegolf (Fewest Average Number of Characters)**: Kimberly Ding (COS ’21) and William Li (COS ’21)**Most Inquisitive**: Allison Chou (MOL ’23) and Ellen Su (CBE ’23)#### Problems can be found below. Solutions to last year’s problems can be accessed here (all coding problems should have a Java, C++, and Python solution for your convenience). Alternatively, you can check out the GitHub repository of COSCON 2021 here!

*(The following is what was shown on the day of the competition, on April 3, 2021.)*

#### Before you begin, here are some tips:

- Each problem will either require you to make a submission on the corresponding page of our HackerRank contest or on Google Drive (in your team’s submission folder). You should submit solutions to problems with the [HR] tag on HackerRank and submit solutions to problems with the [GD] tag to your team’s Google Drive.
- Not all HackerRank problems are “coding” problems: some HackerRank problems require you to work out a solution and then just print your answer in a program. The [HR] tag merely indicates that you need to submit your solution on HackerRank.
- We recommend that you start with problem one — though if you’re gunning for the prize for the fastest solution, you might choose to ignore this advice (the fastest solution to problem one doesn’t count).
- Problem one is worth five points, while all other problems are worth fifteen points in total. If there are multiple parts to a problem, the weight of each part will be clearly noted in the problem statement.
- So of the problems will require you to submit a write-up or a proof. You may write your answers by hand or type them, but be warned that we will make little to no effort reading illegible solutions.
- All your submissions (both on HackerRank and in your Drive) must be in by
**5:00 PM EST**. Submissions after then will be ignored. - Don’t hesitate to reach out either by email or by stopping by in our Zoom room if you have any questions/concerns about the rules or problems! We would love to meet you all.