Archived News


NIMO Contest 32 Winners

Congratulations to all 115 participants in the 32nd NIMO contest! Carl Schildkraut and Luke Robitaille achieved perfect scores. The top official participants were:

  1. Carl Schildkraut, 56 points (penalty 137.2)
  2. Luke Robitaille, 56 points (penalty 141.1)
  3. Benjamin Qi, 43 points (penalty 75.1)
  4. Zack Chroman, 42 points (penalty 65.4)
  5. Akshaj Kadaveru, 42 points (penalty 71.2)
  6. Swapnil Garg, 42 points (penalty 81.4)
  7. Andrew Gu, 42 points (penalty 91.2)
  8. Jeffery Li, 42 points (penalty 93.6)
  9. Ankan Bhattacharya, 32 points (penalty 114.9)
  10. Alex Lee, 31 points (penalty 2.1)

NIMO Contest 31 Winners

Congratulations to the participants in the 31st NIMO monthly contest (Revenge)! The top scorers were:

  1. Ankan Bhattacharya, 56 points (penalty 155.3)
  2. Brandon Wang, 56 points (penalty 215.1)
  3. Andrew Lin, 48 points (penalty 139.8)
  4. Jeffery Li, 39 points (penalty 143.0)
  5. Stan Zhang, 37 points (penalty 80.0)
  6. Andrew Gu, 37 points (penalty 115.3)
  7. Benjamin Qi, 37 points (penalty 117.4)
  8. Swapnil Garg, 31 points (penalty 72.8)
  9. Joseph Heerens, 29 points (penalty 24.4)
  10. Rohith Sajith, 24 points (penalty 90.0)

NIMO Contest 29 Winners

Congratulations to all 153 participants in the 29th NIMO monthly contest! The top scorers were:

  1. Jacob Zhang, 48 points (penalty 100.8)
  2. Ankan Bhattacharya, 48 points (penalty 104.3)
  3. Benjamin Qi, 48 points (penalty 133.0)
  4. Brandon Wang, 48 points (penalty 211.3)
  5. Andrew Gu, 48 points (penalty 232.9)
  6. Zack Chroman, 41 points (penalty 252.2)
  7. Jason Zou, 39 points (penalty 182.4)
  8. Jeffery Li, 38 points (penalty 57.6)
  9. Swapnil Garg, 38 points (penalty 71.0)
  10. Jeffrey Huang, 38 points (penalty 112.0)

NIMO Contest 28 Winners

Congratulations to all 160 participants in the 28th NIMO monthly contest! The top scorers were:

  1. David Chen, 49 points (penalty 156.1)
  2. Brandon Wang, 48 points (penalty 154.8)
  3. Luke Robitaille, 46 points (penalty 77.2)
  4. Swapnil Garg, 46 points (penalty 108.0)
  5. Yuan Yao, 46 points (penalty 108.3)
  6. Vincent Huang, 46 points (penalty 113.3)
  7. Joseph Heerens, 46 points (penalty 114.6)
  8. Benjamin Qi, 46 points (penalty 116.0)
  9. Kevin Qian, 46 points (penalty 119.3)
  10. Adam Bertelli, 46 points (penalty 130.9)

2016 NIMO Summer Contest Results

We were informed recently that no results were posted for the Summer Contest held last August. As such, here were the top ten scorers on that contest:

  1. Yuan Yao, 66 points (total 120)
  2. Ankan Bhattacharya, 54 points
  3. Alex Gu, 47 points
  4. Brandon Wang, 46 points
  5. Kevin Liu, 44 points
  6. Pratik Rathore, 41 points (penalty 33.8)
  7. Erik Metz, 41 points (penalty 52.0)
  8. Ajit, 36 points
  9. Jeffrey Huang, 35 points
  10. Andrew Gu, 34 points

NIMO Contest 27 Winners

The first NIMO contest of the 2016-17 school year was held on Sep 26, 2016. Congratulations to all the participants, especially the top scorers, and especially Ankan Bhattacharya, the only perfect scorer. The full results are as follows:

  1. Ankan Bhattacharya, 56 points (penalty 160.1)
  2. Andrew Gu, 48 points (penalty 120.2)
  3. Jeffery Yu, 48 points (penalty 148.0)
  4. Jeffery Li, 39 points (penalty 117.1)
  5. Alex Gu, 38 points (penalty 139.4)
  6. Joseph Heerens, 38 points (penalty 164.7)
  7. Spencer Cumtons, 37 points (penalty 91.6)
  8. Siye Zhu, 30 points (penalty 103.9)
  9. Benjamin Qi, 30 points (penalty 107.2)
  10. Ben Kang, 29 points (penalty 49.1)
Thanks to all participants. We hope to see you again for the October contest, and on the Art of Problem Solving forums afterwards!

NIMO Contest 26 Winners

Congratulations to the winners of the May contest, the last competition of the school year! The top three contestants were:

  1. Lazar Ilic, 32 points (penalty 85.8)
  2. James Lin, 30 points (penalty 70.3)
  3. Yuan Yao, 30 points (penalty 104.9)
The next highest scorers were:
  1. Swapnil Garg, 30 points (penalty 136.1)
  2. Harish Vemuri, 24 points (penalty 22.4)
  3. Wentinn Liao, 24 points (penalty 67.5)
  4. Henrik Boecken, 24 points (penalty 71.1)
  5. Goh Han, 24 points (penalty 139.3)
  6. Jason Chen, 22 points (penalty 85.4)
  7. Michael Kural, 22 points (penalty 89.5)
Thanks to all that participated! We hope that you enjoyed the problems this year. Please join us again for the exciting Summer Contest!

NIMO Contest 25 Winners

Congratulations to the winners of our April 2016 Revenge contest! The top three contestants were:

  1. Erik Metz, 46 points (penalty 234.7)
  2. Benjamin Qi, 41 points (penalty 159.6)
  3. Jason Chen, 37 points (penalty 55.1)
The next highest scorers were:
  1. Akshaj Kadaveru, 37 points (penalty 87.7)
  2. Lazar Ilic, 37 points (penalty 119.3)
  3. Noah Cook, 37 points (penalty 228.9)
  4. Farrell Eldrian Wu, 31 points (penalty 142.8)
  5. Richard Yi, 30 points (penalty 118.2)
  6. Carl Joshua Quines, 29 points (penalty 146.3)
  7. Rithvik Pasumarty, 27 points (penalty 80.5)
Thanks to all of our participants!

NIMO 2016 Fun Round

We hope that you enjoyed our problems and puzzles on this year's Fun Round! Congratulations to the people who solved all eight problems:

  1. Alex Lee
  2. Jeffery Li
  3. Sam Ferguson
  4. Vincent Huang
  5. Michael Diao
  6. Jason Chen
  7. Alex Gu
  8. Hahn Lheem
  9. David Lee

Of course, due to the informal and cooperative nature of the Fun Round, no prizes will be awarded, but thank you to everyone who participated! Our next (and legitimate) contest, Revenge 25, is in only a couple of days.


NIMO Contest 24 Winners

Congratulations to the winners of our February 2016 contest, especially Yuan Yao, who achieved a perfect score! The top three contestants were:

  1. Yuan Yao, 56 points (penalty 143.7)
  2. James Lin, 46 points (penalty 148.3)
  3. Franklyn Wang, 40 points (penalty 111.7)
The next highest scorers were:
  1. Kevin Sun, 40 points (penalty 131.9)
  2. Jeffery Yu, 40 points (penalty 193.1)
  3. Nicky Sun, 37 points (penalty 69.2)
  4. Jeffrey Huang, 37 points (penalty 91.3)
  5. Jason Lee, 37 points (penalty 106.5)
  6. James Shi, 37 points (penalty 127.9)
  7. Xuming Liang, 37 points (penalty 149.8)
Thanks to all of the 155 participants!

NIMO Contest 23 Winners

Congratulations to the top scorers on the first contest of 2016:

  1. Jeffery Yu, 46 points
  2. Alex Li, 46 points
  3. Farrell Wu, 46 points
The next highest scorers were:
  1. Lazar Ilic, 43 points
  2. Michael Kural, 41 points
  3. Adam Bertelli, 40 points
  4. Joseph Heerens, 39 points
  5. Swapnil Garg, 38 points
  6. Kevin Li, 37 points
  7. Tristan Shin, 34 points

Congrats also to unofficial participant Alex Katz and Sam Korsky for obtaining a perfect score. Thanks to all 125 contestants who participated!


NIMO Revenge 22 Winners

Congratulations to the top scorers on this year's first of two Revenge contests:

  1. Akshaj Kadaveru, 46 points
  2. Brandon Wang, 46 points
  3. Swapnil Garg, 46 points

Thanks to the 89 of you who participated!


Online Math Open Results

Please see here for the results of the contest. Thanks all for participating!

We'd like to hear your feedback on the contest; please submit this form to send us comments.


Online Math Open --- Fall 2015

The Fall 2015 OMO has started! Navigate to the Contests tab to download a copy of the problems.


Revenge 22 Submissions

We have now opened submissions for the Revenge 22 contest, which will be on December 8, 2015. All contestants are invited (but not required) to suggest problems for the Revenge contest. (You may participate in the Revenge regardless of whether you submit questions; this is just to give people a chance at writing their own problems!)

Click here to access the problem submission form. Please try to submit problems by mid-November at the latest, so the staff has adequate time to review them.


NIMO Contest #21 Winners

We apologize for the several irregularities on this contest. Nonetheless, here are the top scores:

  1. Lazar Ilic, 37 points
  2. Farrell Wu, 36 points
  3. Vincent Huang, 33 points

Thanks to the 135 of you who participated!


NIMO Contest #20 Winners

Congratulations to the three perfect scores on the first contest of the year:

  1. Lazar Ilic, 56 points
  2. Adam Bertelli, 56 points
  3. Jeffrey Huang, 56 points

Thanks to the 106 of you who participated!


NIMO Summer Contest 2015 Winners

Congratulations to the top scores on this year's Summer Contest:

  1. Kevin Sun, 70 points
  2. Alexander Katz, 55 points
  3. Yang Liu, 52 points

Thanks to the 140 of you who participated. We look forward to seeing you again next year!


NIMO Contest #19 Winners

Congratulations to the winners of NIMO Contest #19:

  1. Alec Sun, 42/42 (penalty 57.2)
  2. Nikhil Reddy, 42/42 (penalty 114.0)
  3. Yang Liu, 42/42 (penalty 130.8)

Congratulations also to Kevin Sun and Michael Tang for perfect scores.

Thanks to everyone for participating in our last monthly contest of the year! We look forward to seeing you again during the Summer Contest and next year.


Spring OMO 2015 Problems, Solutions and Results

If you have a moment, we'd love to hear your thoughts on this contest. Thank you all for participating!

OMO Spring 2015 Problems
OMO Spring 2015 Solutions
Results
Statistics
Top Teams

NIMO April Fun Round

Thanks to everyone who tried out the April Fool's problems.

Congratulations to the following students for completing all eight problems:

Abishek Hariharan, Adam Bertelli, Ahaan Rungta, Akshaj Kadaveru, Alec Sun, Alex Gu, Alex Hong, Allen Chen, Benjamin, Brian Chen, Daniel Chiu, Daniel Zhu, Dilhan Salgado, Erik Metz, Guangqi Cui, Jack Gurev, Jason Chen, Jason Xia, Jason Zou, Jeffery Li, Jeffery Yu, Kaan Dokmeci, Kevin Jiang, Kevin Liu, Kevin Qian, Kevin Sun, Nathan Gross, Shwetark Patel, Steven Qu, Timothy Qian, Victor Chen, Vincent Huang, Yuan Yao


NIMO Contest #18 Winners

Congratulations to the winners of NIMO Contest #18:

  1. David Stoner, 47/56 (penalty 174.5)
  2. Alex Gu, 40/56 (penalty 117.5)
  3. Michael Kural, 39/56 (penalty 195.5)
Thanks to everyone for participating!

NIMO Contest #17 Winners

Congratulations to the winners of NIMO Contest #17:

  1. Michael Kural, 56/56 (penalty 247.9)
  2. Tomas Choi, 48/56 (penalty 209.8)
  3. Yuan Yao, 46/56 (penalty 151.5)
Thanks to everyone for participating!

NIMO Contest #16 Winners

Congratulations to the winners of NIMO Contest #16:

  1. Tiancheng Qin, 47/56 (penalty 186.5)
  2. Yang Liu, 46 (penalty 96.3)
  3. David Stoner, 46 (penalty 104.7)
Thanks to everyone for participating!

Fall OMO Contest has Started

Please click here to download a copy of the problems and view clarifications.


NIMO Contest #15 Winners

Congratulations to the winners of NIMO Contest #15:

  1. Richard Yi, 56/56 (penalty 119.1)
  2. Eric Xu, 46 (penalty 74.5)
  3. Jack Gurev, 46 (penalty 82.2)
Thanks to everyone for participating!

Summer Contest and OMO Dates

The NIMO 2014 Summer Contest will take place on August 23 at 5PM Pacific time, or 8PM Eastern time.

In addition, the OMO 2014 Fall contest has tentatively been scheduled for October 17 - October 28, 2014. We will make announcements once this date has been finalized.


NIMO Contest #14 Winners

Congratulations to the winners of NIMO Contest #14:

  1. Alex Li, 50/56 (penalty 196.8)
  2. Kevin Sun, 48 (penalty 101.7)
  3. Tashin Saffat, 48 (penalty 123.2)
Thanks to everyone for participating!

OMO Spring 2014 Results Available

The OMO Spring 2014 results are available! Please check the OMO Problems page to see them.

We'd love to hear what you thought of the OMO Spring 2014 Contest. If you have a moment, please help us improve the next OMO by filling out the post-contest survey here.


NIMO Contest 14 Moved

Due to the National MathCounts competition, we have decided to push back Contest 14 by one week.


NIMO Revenge Contest #13 Winners

Congratulations to the winners of NIMO Contest #13:

  1. Kevin Sun, 56/56 (penalty 309.0)
  2. Yang Liu, 46 (penalty 168.4)
  3. Alec Sun, 46 (penalty 182.5)
Thanks to everyone for participating!

Thanks to everyone who participated in the 2014 Winter Contest!

Scores are out of 56. You may view your team's score for each problem here.

  • 1st place: We Beat Kevin in PUMaC Geo (47), with team members Kevin Li, Rachel Zhang, Bill Yan Huang, and Michael Kural.
  • 2nd place: awesome (42), with team members Lazar Ilic, Patrick Guo, Alexander Whatley, and Steven Chen.
  • 3rd place: sa (41), with team members Robin Park, Kevin Sun, Yang Liu, and James Lin.
  • 4th place: The Numerators (40), with team members Ahaan Rungta, Cody Johnson, Tim Vermeulen, and Michael Ren.
  • 5th place: Math_Team (39), with team members Matthew Brecher, Calvin Lee, Max Fishelson, and Gideon Leeper.

Congratulations to the winners!


NIMO Contest #12 Winners

Congratulations to the winners of NIMO Contest #12:

  1. Kevin Chang, 46/56 (penalty 167.2)
  2. Kevin Sun, 46 (penalty 189.1)
  3. Yang Liu, 46 (penalty 206.4)
Thanks to everyone for participating!

NIMO February Revenge Moved

Due to downtime on our problem server, we have not been able to access the student submissions for the upcoming Revenge contest for the past six days. As a result, we will be deferring the Revenge to March 24, 2014. We will still have a contest tomorrow on Monday, February 24; it will be the contest originally scheduled for March 3, 2014.

You are welcome to continue making submissions for the Revenge. Until the server returns, please submit them by email to info at internetolympiad.org. Remember that you must include

  1. The problem statement, answer, and a full solution, preferably in LaTeX.
  2. Your name. You may indicate that you wish for your submission to be anonymous.
  3. Please include "Revenge submission" in the subject line.

We apologize for any inconvenience caused by the server issues.


NIMO Contest #11 Winners

Congratulations to the winners of NIMO Contest #11:

  1. James Lin, 48/56 (penalty 73.0)
  2. Kevin Sun, 39 (penalty 134.8)
  3. Michael Ren, 39 (penalty 143.1)

Thanks to everyone for participating!


NIMO Contest #10 Winners

Congratulations to the winners of NIMO Contest #10:

  1. James Lin, 37/56 (penalty 163.3)
  2. Kevin Li, 33 (penalty 113.8)
  3. Andrew He, 33 (penalty 134.5)

NIMO Contest #9 Winners

Congratulations to the winners of NIMO Contest #9:

  1. Kevin Sun, 48/56 (penalty 236.5)
  2. Yang Liu, 41 (penalty 108.5)
  3. Michael Kural, 41 (penalty 223.3)

NIMO Contest #8 Winners

Congratulations to the winners of NIMO Contest #8:

  1. Yang Liu, 46/56 (penalty 133.0)
  2. Steven Hao, 46 (penalty 133.3)
  3. Michael Kural, 41 (penalty 185.3)

OMO Fall 2013 Results

We had a total of 220 teams for the 2013 Fall OMO. Thank you to all participating! You can now find problem statistics and results here. Solutions will be available soon.


OMO Registration is Now Open

Thank you for your patience! You can now register your team for the OMO Fall 2013 under the Contests & Rules tab. See the OMO Info tab for further information.

The contest itself will take place from October 18, 2013 at 7PM ET to October 29, 2013 at 7PM ET.


Now Accepting Submissions for Revenge 9

We are now accepting proposals for the student-written Revenge 9, scheduled for November 13.

All contestants are invited to submit problems for Revenge 9; you may still participate regardless of whether you submit problems, or your problem is selected. You should make your submissions by October 23, 2013, in order to make sure that we have time to review them.

The submission form is located here. Please, read all the instructions before submitting your proposals!


Contest 8

Contest 8 is now online, under the "Contests & Rules" tab. The contest itself is scheduled for September 24, 2013, at 8PM ET.

Up until 24 hours before the contest, we will have a test run using the questions from the May 2013 contest. We encourage you to try out the new system using the test run before the actual contest date.


Contest Dates for the 2013-2014 School Year

The dates for NIMO contests in the 2013-2014 school year are now available! Please see here.

One notable change is that internetolympiad.org will be hosting the 2013-2014 OMO contests. Goodbye, free web hosting! The problem-writing committees will remain separate, so both contests will retain the same style of problems that appeared previously.


Summer Contest Winners

Congratulations to the winners of the 2013 NIMO Summer Contest:

  1. James Lin, 79/120
  2. David Stoner, 77
  3. Andre Arslan, 63
  4. Steven Hao, 62
  5. Kevin Sun, 59

The contest problems and solutions may be viewed here.


Congratulations to the winners of NIMO Contest #7:

  1. Eric Schneider, 25/42 (penalty 46)
  2. Robin Park, 25 (penalty 47)
  3. Sunny Nahar, 22 (penalty 60)

Those with a score of 12 or higher were entered into a drawing for the fourth prize. The winning of the drawing was Eric Xu. Congratulations to all the winners!


Contest #7 will be on Monday, May 27, 2013 at 8:00 PM EDT (5:00 PM PDT). There will be five problems to solve in 40 minutes, worth 5, 7, 8, 10 and 12 points. Detailed rules can be found on the monthly rules page.


The NIMO April Fools' Contest will take place on Monday, April 1, 2013 from 12:01 AM EDT to 11:59 PM EDT. There will be 12 problems to solve, and contestants can submit answers to any of the problems at any time during this interval. Each contestant's overall score will be determined by the sum of the weights of the problems solved correctly, and ties will be broken by the total number of incorrect submissions. In particular, the time of submission will not be used. Each contestant may attempt each problem up to 5 times, but only the last submission will be counted. All answers are positive integers. Problem values are all primes, and the maximum possible score is 101.


Congratulations to the winners of the student-written NIMO Contest #6:

  1. Kevin Sun, 74/74 (penalty 207)
  2. Kevin Li, 65 (penalty 295)
  3. David Stoner, 64 (penalty 146)

Those with a score of 36 or higher were entered into a drawing for the fourth prize. The winning of the drawing was Yang Liu. Congratulations to all the winners!

Contest #6 is today (February 24) at 8PM EST / 5PM PST. Log in and go to the problems page to start the contest.

Problems are worth 5, 5, 6, 6, 7, 7, 8, 9, 10, 11 points, in that order.


If you intend to participate in the winter contest, you should go to winter.internetolympiad.org. Registration between the two systems is separate.

To all interested students, parents, teachers, and coaches:

We are pleased to announce that registration has opened for the NIMO 2013 Winter Contest. The contest will take place from March 1, 2013 to March 11, 2013. During this period, four-member teams will spend one hour solving and writing solutions to eight challenging problems. Registration, as well as the contest itself, is at winter.internetolympiad.org. For more information, please consult the Winter Contest Rules. Registration for the 2013 Winter Contest does not affect registration for monthly contests.

Amazon.com gift certificates will be awarded to all team members of the top three teams, courtesy of Quixey.

If there are any questions, please email info@internetolympiad.org.

Best,

The NIMO Committee


We're happy to announce that we will be running a student-written contest for February! Contestants are asked to propose up to five problems for the next NIMO contest. Here are some guidelines on how you can showcase your creations:

The answer to each problem should be a positive integer not exceeding 231 - 1 = 2147483647. Problems should not be taken from existing sources. Please submit problems and solutions to the form at http://goo.gl/QpAUx.

The deadline for submission is February 10, 2012. Please submit proposals on time so the committee has adequate time to review your proposals. You should not discuss your proposals before the contest. Your problem may be edited before it appears on the contest. You may participate in the contest regardless of whether you propose problems, or whether your problem is selected to appear on the contest.

The contest will take place on February 24, 2012; we will decide later on the format of the contest. If you have any inquiries, please feel free to write the NIMO team at info@internetolympiad.org

Happy problem writing!

The NIMO Committee


Congratulations to the winners of NIMO Contest #5:

  1. Eric Schneider, 56/56 (penalty 130)
  2. Brian Shimanuki, 56 (penalty 255)
  3. Haoqing Wang, 48 (penalty 113)

The top scores were 56, 56, 48, 48, 47, 46, 46, 46, 41, 40. Those with a score of 29 or higher were entered into a drawing for the fourth prize. The winning of the drawing was Calvin Lee.

Prize winners will be contacted shortly. It's not too late to submit problems for Contest #6 (see here), which will be on February 24. The submission deadline is February 10.


NIMO Contest #5 will be on Thursday, January 24, 2013 at 8:00 PM EST (5:00 PM PST). There will be 8 problems to solve in 30 minutes, and the problems will be worth 5, 5, 6, 6, 7, 8, 9, and 10 points, in that order. For detailed rules see the Monthly Contest Rules.


Congratulations to the winners of NIMO Contest #4:

  1. Calvin Deng, 55 of 74 (penalty 180)
  2. Eric Schneider, 47 (penalty 101)
  3. Scott Wu, 45 (penalty 86)

The top scores were 55, 47, 45, 45, 42, 42, 40, 37, 37, 37. Those with a score of 24 or higher were entered into a drawing for the fourth prize. The winner of the drawing was Eric Xu.

Prize winners will be contacted shortly. Stay tuned for announcements of Contest #5 and our annual Winter Contest!


NIMO Contest #4 will occur on Monday, December 17, 2012 at 8:00 PM EST (5:00 PM PST). There will be 10 problems to solve in 45 minutes, and the problems will be worth 5, 5, 6, 6, 7, 7, 8, 9, 10, 11 points, in that order. Prizes will be awarded to the top 3 eligible (see below) contestants and one random contestant who finished in the top 30% of all contestants. Any individual may participate in the monthly contests. However, only those who have never enrolled at a university are eligible to win prizes.

Contestants may submit answers to any problem at any time during the contest, with a limit of 3 submissions per problem. Ranking will be in decreasing order of total score (higher score is better), and ties will be broken by comparing penalties. Each contestant's penalty begins at 0, and for each correct problem, the sum of the time for a correct submission plus 20 minutes per incorrect submission is added to the penalty. Note that if a contestant does not correctly solve a problem, then the problem does not contribute to his or her penalty.


Congratulations to the winners of NIMO Contest #3 (November 2012). The winners were:

  1. Calvin Deng, 60 (penalty 182)
  2. Steven Hao, 51 (penalty 401)
  3. David Stoner, 42 (penalty 148)

The top scores were 60, 51, 42, 42, 39, 38, 38, 38, 38, 36. Those with a score of 22 or higher were entered into a drawing for the fourth prize. The winner of the drawing was James Lin.


We were very disappointed to have clear instances of cheating on Contest 3. Collaboration with others, use of multiple accounts to circumvent the time limit, using computational aids, etc., are all not permitted. We expect all contestants to abide by the Honor Code and the rules of the contest. If you are caught cheating you will be disqualified from the contest and banned for life. This policy is retroactive to Contest 3.

In the coming days we will clarify the set of rules and add a more prominent link on the home page.

Problem 9 had a typo. The problem should have read "A set of real numbers S" rather than "A set of integers S." Unfortunately, we did not identify the typo until after the contest. The posted problem was far easier than the intended problem; we are granting 2 points to those who submitted the correct answer of 0. This does not affect the placement of the top 3 in the standings. Scores will be updated on the website shortly. The cutoff for top 20 in the standings is now 28 points out of 66.

We sincerely apologize for any inconvenience our error in problem 9 has caused. We hope that this does not discourage any of you from participating in future contests.


Congratulations to the winners of NIMO Contest #2 (October 2012). The winners were:

  1. David Stoner, 46 (penalty 67)
  2. Kevin Sun, 46 (penalty 92)
  3. Eric Schneider, 46 (penalty 137)

The top scores were 46, 46, 46, 40, 38, 38, 37, 37, 33, 33. Those with a score of 31 or higher were entered into a drawing for the fourth prize. The winner of the drawing was Michael Lu.


Congratulations to the winners of NIMO Contest #1 (September 2012). The winners were:

  1. Ray Li, 37 (penalty 63)
  2. Scott Wu, 37 (penalty 97)
  3. Alex Song, 37 (penalty 117)

The top scores were 37, 37, 37, 31, 31, 29, 29, 29, 29, 29, 29, 29. Those with a score of 20 or higher (top 30% of scorers) were entered into a drawing for the fourth prize. The winner of the drawing was Kevin Sun.


Congratulations to the winners of the 2012 NIMO Summer Contest!

  1. Alex Song, 28 ($25 Amazon gift certificate)
  2. Michael Zhang, 23 ($20 Amazon gift certificate)
  3. Ivan Koswara, 16 ($15 Amazon gift certificate)

All participants scoring 8 or higher were entered into the random drawing for the $10 Amazon gift certificate. The winner of the drawing was Alexander Schlesinger.

You can view your score after logging in and clicking "Control Panel" -> "Your scores."

Thanks to all of the participants!


We are excited to announce that NIMO will be introducing a series of monthly contests. The format of these contests is variable, but expect most of them to be short-answer contests with a time limit not greater than one hour.

The first such contest will occur on Monday, September 17, 2012 at 8:00 PM EDT (5:00 PM PDT). There will be 8 problems to solve in 30 minutes, and the problems will be worth 5, 5, 6, 6, 7, 8, 9, and 10 points, in that order. Prizes will be awarded to the top 3 eligible (see below) contestants and one random contestant who finished in the top 30% of all contestants. Any individual may participate in the monthly contests. However, only those who have never enrolled at a university are eligible to win prizes.

Contestants may submit answers to any problem at any time during the contest, with a limit of 3 submissions per problem. Ranking will be in decreasing order of total score (higher score is better), and ties will be broken by comparing penalties. Each contestant's penalty begins at 0, and for each correct problem, the sum of the time for a correct submission plus a 20 minutes per incorrect submission is added to the penalty. If a contestant does not correctly solve a problem, then the problem does not contribute to his or her penalty.

You may sign up for an account via the "Register" link on the sidebar. It is not necessary to register a new account for each contest. Additionally, if you registered for the 2012 NIMO Summer Contest, then you may continue to use the same account for the monthly contest.

We look forward to your participation in this new series of monthly contests!


The 2012 NIMO Summer Contest will take place on Friday, August 17 from 4:00 PM to 4:15 PM PDT (7:00 to 7:15 EDT). Unlike the NIMO Winter Contest, the Summer Contest is an individual contest, with 15 minutes given to solve 15 short-answer problems. Format, rules, and other information is available here. To start the contest, go to the problems page.


Thanks to everyone who participated in the 2012 Winter Contest!

We apologize for the long delay in grading. Multiple technical issues as well as grading disputes took considerable time for us to solve. Nevertheless, here are the winners of the 2012 NIMO Winter Contest. Scores are out of 56.

  • 1st place: dvhsmathclub (53), with team members Benjamin Tong, Andrew Chen, Trevor Cai, and Saran Prembabu. Each member of this team received a $15 Amazon gift certificate.
  • 2nd place: Flying Unicorns (49), with team members Andrew Wang, Tony Jiang, Steven Hao, and Julia Huang. Each member of this team received a $10 Amazon gift certificate.
  • 3rd place: casawa (46), with team members Chaitanya Asawa, Alexander Clifton, Kevin Li, and Apoorva Shah. Each member of this team received a $25 Art of Problem Solving gift certificate.
  • 4th place: VAPSnimo (43), with team members Alexander Whatley, Steven Chen, Patrick Guo, and Victor Zhou.
  • 5th place: graubner (41), with team members Scott Wu, Alex Wang, Mark Sellke, and Bob Liang.

Congratulations to the winners! All of these scores are very impressive. Prizes will be sent to each member of the top 3 scoring teams. Teams can access their scores by logging in, clicking "Control Panel" on the sidebar, then clicking "Your scores." Ties were broken by item analysis. Statistics will be posted shortly. Thank you for your patience.


2012 Winter Contest Announcement

The 2012 NIMO Winter Contest will take place from January 22 to 28, 2012, all week. Teams are given an hour to solve and write the solutions to as many problems as possible. You can read more about the rules and the contest format.


2011 Summer Contest

The 2011 NIMO Summer Contest will take place on Wednesday, August 17 from 4:00 PM to 4:15 PM PDT (7:00 to 7:15 EDT). Unlike the regular NIMO, the Summer Contest is an individual contest, with 15 minutes given to solve 15 short-answer problems. Format, rules, and other information is available here.


2011 Winter Contest

Please fill out this feedback form to improve next year's NIMO.

Teams are given an hour to solve and write the solutions to as many problems as possible. You can read more about the rules and the contest format here.