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Topcoder Open

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Topcoder Open (TCO)
File:Tco18-logo.png
Topcoder Open 2018 logo
Frequencyannually
CountryUSA
Years active2001 - nowadays
InauguratedNov 2 - 3, 2001
Most recentOctober 21–24, 2017
ActivityCompetitive Programming, Data Science, Design, and Software Development Championship
Organized byTopcoder
Websitehttp://tco18.topcoder.com

Topcoder Open (TCO) is an annual design, software development, data science and competitive programming championship, organized by Topcoder, and hosted in different venues around US.[1][2][3][4][5][6][7][8][9] In the first two years, 2001 and 2002, the tournament was titled TopCoder Invitational.

In addition to the main championship, from 2001 to 2007 Topcoder was organizing an annual TopCoder Collegiate Challenge tournament, for college students only.[10][11] Also from 2007 to 2010 TopCoder High School competition was held.

From 2015, Topcoder Regional events are held through the year in different countries.[12]

Competition Tracks

Competition tracks included in Topcoder Open tournament changed through its history. Many of them resemble the types of challenges offered to Topcoder Community through the year, but there is no 1:1 match. Here is the alphabetical list of all competition tracks ever present at TCO:

Algorithm Competition (SRM)

Timeline: 2001 - nowadays

Champions: China Yuhao Du xudyh (2017); Japan Makoto Soejima rng_58 (2016, 2011, 2010); Russia Petr Mitrichev Petr (2015, 2013, 2006); Belarus Gennady Korotkevich tourist (2014); Russia Egor Egor (2012); China Bin Jin crazyb0y (2009); Poland Tomasz Czajka (2008, 2004, 2003); Netherlands Jan Kuipers Jan_Kuipers (2007); Poland Eryk Kopczyñski Eryx (2005); Australia John Dethridge John Dethridge (2002); United States jonmac (2001).

Details:

The only track that was present at all main TCOs events, and at the most of other Topcoder events. Follows the format of regular 1.5 hours Single Round Matches:[13]

  • The Coding Phase – 75 mins: All competitors are presented with the same three algorithmic problems of different complexity, each problem has its own maximal number of points. Problem descriptions are initially invisible. Competitors have 75 minutes to solve these problems. Competitor can open any problem description in any order; once he opened a problem, the number of points he can get for the correct solution of that problem starts decreasing over time. When competitor submits problem solution (a code that successfully compiles), he is awarded with the current amount of points he can get for that problem. He can re-submit a solution, getting the further decrease amount of points, minus extra penalty for the resubmission. During the phase competitors can see the current points awarded to each participant, but they don't know whether solutions of those participants are correct or wrong, thus whether these scores will hold after The System Testing Phase, or will be reset.
  • The Challenge Phase – 15 mins: Each competitor can see all submission done by other competitors. He can (optionally) challenge any of them, submitting test cases that will cause other competitor's submission produce a wrong result. Submission of correct challenge test case gives submitter 50 points award, submission of an incorrect test case (i.e. the challenged solution can solve it successfully) will lead to 25 points penalty for the test case submitter.
  • The System Testing Phase – In the last phase system tests are automatically executed for all submissions from all competitors. If a submission fails testing, the scores awarded for that submission during The Coding Phase are reset to zero. The final scores after the system testing determine the winner.

First to Finish (F2F)

Timeline: 2009 - 2014, 2016 - nowadays

Champions: Nigeria Akinwale Ariwodola akinwale (2017, 2014); China vvvpig (2016); India Pratap Koritala supercharger (2013); China Lan Luo hohosky (2012); China Yang Li Yeung (2011); Ukraine Margaryta Skrypachova Margarita (2010); China Ninghai Huang PE (2009).

Details:

Officially called as Mod Dash from 2009 to 2013, and First2Finish afterwards. Competitors are provided with set of small programming tasks (like bug fixes / enhancements in an existing codebase), and they get scores based on who correctly resolves each task first. The exact rules for on-site competition may vary from year to year.

Information Architecture

Timeline: 2015 only.

Champions: Spain Silvana Vacchina f0rc0d3r (2015).

Details:

Provided with client requirements for a software product, competitors are asked to create a wireframe mockup of the future app / website.

Marathon Match (MM)

Timeline: 2007 - nowadays

Champions: Poland Przemyslaw Debiak Psyho (2017, 2016, 2014, 2013, 2011, 2008); China TianCheng Lou ACRush (2015); South Korea Won-Seok Yoo ainu7 (2012); Japan Yoichi Iwata wata (2010); Russia Andrey Lopatin KOTEHOK (2009); Poland Mateusz Zotkiewicz Mojito1 (2007).

Details:

Officially called as just Marathon from 2007 to nowadays. Follows the format of regular MM competitions (a 1–2 weeks long online, and 1 day long during on-site competitions). Competitors are provided with the same algorithmic / data science problem, which is judged objectively with a live leaderboard, visible to everybody. Everybody can submit multiple times with no penalties, with the goal to come up with a code that scores the maximal possible amount of scores on that problem. During the competition the leaderboard is generated based on submissions testing against a limit number of test cases, and after the contest the final results are determined in a testing against a larger test dataset.

Quality Assurance Competition (QA)

Timeline: 2019

Details:

The QA competition includes: structured and unstructured testing, structured test case writing, and automated testing.

Software Design

Timeline: 2004 - 2014

Champions: China Meng Wang albertwang (2014, 2013); Canada Michael Paweska argolite (2012, 2010); China WuJian Ye BLE (2011); Ukraine Olexiy Sadovnikov saarixx (2009); United States Tim Roberts Pops (2008, 2006); United States Sergey Kalinchenko kyky (2007); Russia Nikolay Archak nicka81 (2005); Romania Adrian Carcu adic (2004).

Details:

Officially called as Component Design from 2004 to 2009, and just Design from 2010 to 2014. Competitors were asked to take client requirements for a software component / product as input, and produce development documentation / technical specifications. Solutions were evaluated by a panel of judges according to objective scorecards.

Software Development

Timeline: 2004 - nowadays

Champions: Spain Sergey Pogodin birdofpreyru (2017); Poland Łukasz Sentkiewicz Sky_ (2016, 2015, 2014); China Zhijie Liu morehappiness (2013); China Yang Li Yeung (2012, 2010); Philippines Franklin Guevarra j3_guile (2011); China GuanZhuo Jin Standlove (2009 - Architecture, 2004); Argentina Pablo Wolfus pulky (2009 - Assembly); China Yanbo Wu assistant (2009 - Component Development); Canada Piotr Paweska AleaActaEst (2009 - Specification); Brazil Romano Silva romanoTC (2008); China Feng He hefeng (2007); Indonesia Sindunata Sudarmagi sindu (2006); China Qi Liu visualage (2005).

Details:

Officially called as Component Development from 2004 to 2009, and just as Development from 2010 to nowadays. The actual rules differ from year to year, but, typically, competitors are present with technical specifications for development of a software component / application / tool, or with a more open, hackathon-style requirements, and they have about 4 hours to implement the component / product in the best possible way. Submitted solutions are evaluated by a panel of judges according to objective scorecards.

UI Design

Timeline: 2007 - nowadays

Champions: Indonesia Panji Kharisma kharm (2017); Indonesia Junius Albertho abedavera (2016, 2015, 2013, 2011); Indonesia Faridah Amalia Mandaga fairy_ley (2014); Thailand Teeraporn Sriponpak iamtong (2012); Indonesia Tri Joko Rubiyanto djackmania (2010); Australia Dale Napier djnapier (2009); Philippines Nino Rey Ronda oninkxronda (2008); China Yiming Liao yiming (2007).

Details:

Officially called as Studio from 2007 to 2014, and UI Design from 2015 to nowadays. Competitors, provided with client requirements, are asked to create the best UI (visual) design for an software product / web portal, etc.

UI Prototype

Timeline: 2015 - 2018

Champions: Sri Lanka Mouly Gunarathne moulyg (2017, 2016); Sri Lanka Dileepa Balasuriya dileepa (2015).

Details:

Competitors are provided with design specifications for a website / web-application, and they should create a working prototype of the frontend within a ~4 hours timeframe. The resulting submissions are judged against objective scorecards.

The List of Topcoder Open Events

These are the main Topcoder Open events, where champions are determined.

The list of Topcoder Open and Regional events, and their winners[14]
Date Event Venue Competition Tracks,[note 1] and Their Champions[note 2]
Nov 2 - 3, 2001 TCI01 (Mashantucket, CT, USA)[15][note 3] Foxwoods Resort Casino SRM (United States jonmac)
Nov 22 - 23, 2002 TCI02 (Uncasville, CT, USA)[16][3][note 4] Mohegan Sun Casino SRM (Australia John Dethridge John Dethridge)
Dec 4 - 5, 2003 TCO03 (Uncasville, CT, USA)[17][note 5] Mohegan Sun Casino SRM (Poland Tomasz Czajka tomek)
Nov 11 - 12, 2004 TCO04 (Santa Clara, CA, USA)[18][note 6] Santa Clara Marriot Dev (China GuanZhuo Jin Standlove), SDg (Romania Adrian Carcu adic), SRM (Poland Tomasz Czajka tomek)
Oct 12 - 14, 2005 TCO05 (Santa Clara, CA, USA)[19][note 7] Santa Clara Marriot Dev (China Qi Liu visualage), SDg (Russia Nikolay Archak nicka81), SRM (Poland Eryk Kopczyñski Eryx)
May 3–5, 2006 TCO06 (Las Vegas, NV, USA)[7][9][20][note 8] Aladdin Resort and Casino Dev (Indonesia Sindunata Sudarmagi sindu), SDg (United States Tim Roberts Pops), SRM (Russia Petr Mitrichev Petr)
Jun 26 - 29, 2007 TCO07 (Las Vegas, NV, USA)[21][note 9] The Mirage Dev (China Feng He hefeng), Dg (China Yiming Liao yiming), MM (Poland Mateusz Zotkiewicz Mojito1), SDg (United States Sergey Kalinchenko kyky), SRM (Netherlands Jan Kuipers Jan_Kuipers)
May 11–15, 2008 TCO08 (Las Vegas, NV, USA)[4][22] The Mirage Dev (Brazil Romano Silva romanoTC), Dg (Philippines Nino Rey Ronda oninkxronda), MM (Poland Przemyslaw Debiak Psyho), SDg (United States Tim Roberts Pops), SRM (Poland Tomasz Czajka tomek)
Jun 1 - 4, 2009 TCO09 (Las Vegas, NV, USA)[23] The Mirage Dev[note 10] (Architecutre: China GuanZhuo Jin Standlove; Assembly: Argentina Pablo Wolfus pulky; Component Development: China Yanbo Wu assistant; Specification: Canada Piotr Paweska AleaActaEst), Dg (Australia Dale Napier djnapier), F2F (China Ninghai Huang PE), MM (Russia Andrey Lopatin KOTEHOK), SDg (Ukraine Olexiy Sadovnikov saarixx), SRM (China Bin Jin crazyb0y)
Oct 11 - 14, 2010 TCO10 (Las Vegas, NV, USA)[24] The Mirage Dev (China Yang Li Yeung), Dg (Indonesia Tri Joko Rubiyanto djackmania), F2F (Ukraine Margaryta Skrypachova Margarita), MM (Japan Yoichi Iwata wata), SDg (Canada Michael Paweska argolite), SRM (Japan Makoto Soejima rng_58)
Sep 25 - 28, 2011 TCO11 (Hollywood, FL, USA)[25] Westin Diplomat Resort & Spa Dev (Philippines Franklin Guevarra j3_guile), Dg (Indonesia Junius Albertho abedavera), F2F (China Yang Lee Yeung), MM (Poland Przemyslaw Debiak Psyho), SDg (China WuJian Ye BLE), SRM (Japan Makoto Soejima rng_58)
Sep 30 - Oct 4, 2012 TCO12 (Orlando, FL, USA)[26][27] Caribe Royale Hotel Dev (China Yang Li Yeung), Dg (Thailand Teeraporn Sriponpak iamtong), F2F (China Kan Luo hohosky), MM (South Korea Won-Seok Yoo ainu7), SDg (Canada Michael Paweska argolite), SRM (Russia Egor Egor)
Nov 10 - 14, 2013 TCO13 (Washington DC, USA)[28][29] Capital Hilton Hotel Dev (China Zhijie Liu morehappiness), Dg (Indonesia Junius Albertho abedavera), F2F (India Pratap Koritala supercharger), MM (Poland Przemyslaw Debiak Psyho), SDg (China Meng Wang albertwang), SRM (Russia Petr Mitrichev Petr)
Nov 16 - 19, 2014 TCO14 - San Francisco (CA, USA)[6][8][30][31] Pier 48 Dev (Poland Łukasz Sentkiewicz Sky_), Dg (Indonesia Faridah Amalia Mandaga fairy_ley), F2F (Nigeria Akinwale Ariwodola akinwale), MM (Poland Przemyslaw Debiak Psyho), SDg (China Meng Wang albertwang), SRM (Belarus Gennady Korotkevich tourist)
Sep 21 - 22, 2015 TCO15 - Yogyakarta (Indonesia)[32][note 11] Eastparc Hotel Dg (Indonesia Junius Albertho abedavera), Pr (Sri Lanka Dileepa Balasuriya dileepa)
Nov 8 - 10, 2015 TCO15 (Indianapolis, IN, USA)[32][note 11] Omni Severin Hotel Dev (Poland Łukasz Sentkiewicz Sky_), IA (Spain Silvana Vacchina f0rc0d3r), MM (China TianCheng Lou ACRush), SRM (Russia Petr Mitrichev Petr)
Nov 18 - 21, 2016 TCO16 (Washington DC, USA)[33] Booz Allen Hamilton Innovation Center Dev (Poland Łukasz Sentkiewicz Sky_), Dg (Indonesia Junius Albertho abedavera), F2F (China vvvpig), MM (Poland Przemyslaw Debiak Psyho), Pr (Sri Lanka Mouly Gunarathne moulyg), SRM (Japan Makoto Soejima rng_58)
Oct 21 - 24, 2017 TCO17 (Buffalo, NY, USA)[34][35][36][37] Buffalo Niagara Medical Campus Dev (Spain Sergey Pogodin birdofpreyru), Dg (Indonesia Panji Kharisma kharm), F2F (Nigeria Akinwale Ariwodola akinwale), MM (Poland Przemyslaw Debiak Psyho), Pr (Sri Lanka Mouly Gunarathne moulyg), SRM (China Yuhao Du xudyh)
Upcoming
Nov 13 - 16, 2018 TCO18 (Dallas, TX, USA)[38][39] Southfork Ranch Dev, Dg, F2F, MM, Pr, SRM
2019 TCO19[40] TBA Dev, Dg, F2F, MM, QA, SRM

Topcoder Open Victories by Countries Represented by Champions

Topcoder Open Victories by Countries Represented by Champions[note 12]
Country Total Competition Tracks[note 1]
Dev Dg F2F IA MM Pr SDg SRM
Argentina Argentina 1 1
Australia Australia 2 1 1
Belarus Belarus 1 1
Brazil Brasil 1 1
Canada Canada 3 1 2
China China 19 8 1 4 1 3 2
India India 1 1
Indonesia Indonesia 8 1 7
Japan Japan 4 1 3
Netherlands Netherlands 1 1
Nigeria Nigeria 2 2
Philippines Philippines 2 1 1
Poland Poland 14 3 7 4
Romania Romania 1 1
Russia Russia 6 1 1 4
South Korea South Korea 1 1
Spain Spain 2 1 1
Sri Lanka Sri Lanka 3 3
Thailand Thailand 1 1
Ukraine Ukraine 2 1 1
United States USA 4 3 1

The List of Topcoder Regional and Other Events

These are minor competition events organized by Topcoder through the year.

The list of Topcoder Open and Regional events, and their winners[41]
Date Event Venue Competition Tracks,[note 1] and their winners[note 13]
Jun 5 - 7, 2001 TCCC01 (San Francisco, CA, USA)[42][note 14] Hilton San Francisco and Towers SRM (United States qubits)
Apr 19 - 20, 2002 TCCC02 (Cambridge, MA, USA)[43][note 15] University Park Hotel @ MIT SRM (United States Daniel Wright dmwright)
Apr 4 - 5, 2003 TCCC03 (Cambridge, MA, USA)[10][44][note 15] University Park Hotel @ MIT SRM (Canada David Arthur dgarthur)
Apr 15 - 16, 2004 TCCC04 (Boston, MA, USA)[45][note 16] Boston Park Plaza Hotel Dev (United States Roman Koshlyak roma), SDg (Ukraine Pavlo Aksonov aksonov), SRM (Poland Tomasz Czajka tomek)
Mar 10 - 11, 2005 TCCC05 (Santa Clara, CA, USA)[46][note 17] Santa Clara Marriot Dev (Canada Gary Linscott gladius), SDg (Romania Adrian Carcu adic), SRM (Netherlands Mathys Vogelzang mathijs)
Nov 14 - 18, 2006 TCCC06 (San Diego, CA, USA)[47][note 18] San Diego Marriot Mission Valley Dev (China Ninghai Huang PE), SDg (Russia Nikolay Archak nicka81), SRM (Russia Petr Mitrichev Petr)
May 18–20, 2007 TCHS07 (West Lafayette, IN, USA)[48][note 19] Purdue University SRM (individual: Russia Yuri Petrov Burunduk2; team: Croatia V. Gimnazija) [note 20]
Oct 30 - Nov 2, 2007 TCCC07 (Orlando, FL, USA)[11][49] Disney World Contemporary Resort Dev (China Ninghai Huang PE), Dg (Indonesia Junius Albertho abedavera), MM (United States Michael Skinner paranoia), SDg (Russia Nikolay Archak nicka81), SRM (Russia Petr Mitrichev Petr)
Mar 14 - 16, 2008 TCHS08 (West Lafayette, IN, USA)[50] Purdue University SRM (China Yang Yi ahyangyi)
Jan 3 - 24, 2009 TCHS09 (online-only)[51] online-only SRM
Feb 27 - Mar 20, 2010 TCHS10 (online-only)[52] online-only SRM (Belarus Gennady Korotkevich tourist)
May 31, 2015 TCO15 - St. Petersburg (Russia)[53][54] ITMO University Dev, SRM
Jun 20, 2015 TCO15 - San Francisco (CA, USA)[32] MemSQL HQ Dev, SRM
Jul 18, 2015 TCO15 - Tokyo (Japan)[55] Dwango offices Dev, SRM
Aug 22, 2015 TCO15 - Jaipur (India)[56][57] Manipal University Dev, SRM
Jun 5, 2016 TCO16 - Beijing (China)[58] ThoughtWorks HQ SRM
Jun 17, 2016 TCO16 - New York City (USA)[59] Google offices SRM
Jul 30, 2016 TCO16 - Jaipur (India)[60] Hotel Clarks Amer Dg, SRM
Aug 6 - 7, 2016 TCO16 - Yogyakarta (Indonesia)[61] Hotel Royal Ambarrukmo Dg
Sep 3, 2016 TCO16 - St. Petersburg (Russia)[12][62] ITMO University SRM
Apr 29, 2017 TCO17 - Austin (TX, USA)[63] Capital Factory SRM
May 7, 2017 TCO17 - St. Petersburg (Russia)[64] ITMO University SRM
Jun 24, 2017 TCO17 - Beijing (China)[65] Meituan-Dianping HQ SRM
Aug 12 - 13, 2017 TCO17 - Yogyakarta (Indonesia)[66] Hotel Royal Ambarrukmo Dg
Aug 20, 2017 TCO17 - Bangalore (India)[67] Cowrks SRM
Sep 2, 2017 TCO17 - Warsaw (Poland)[68] University of Warsaw, Faculty of Mathematics, Informatics and Mechanics SRM
Sep 8, 2017 TCO17 - Pittsburgh (PA, USA)[69] Google offices SRM
May 12, 2018 TCO18 - Warsaw (Poland)[70] University of Warsaw, Faculty of Mathematics, Informatics and Mechanics MM, SRM
May 26, 2018 TCO18 - Beijing (China)[71] Jingdong HQ SRM
July 21, 2018 TCO18 - Bangalore (India)[72] Amrita School of Engineering SRM
August 4, 2018 TCO18 - Buenos Aires (Argentina)[73] Medallia, Buenos Aires office SRM
August 11-12, 2018 TCO18 - Yogyakarta (Indonesia)[74][75] Hotel Royal Ambarrukmo Dg
Upcoming

Notes

  1. ^ a b c The following abbreviations are used in the table "The list of Topcoder Open and Regional events": Dev = Software Development (Code); Dg = UI Design (also called as Studio Design); F2F = First to Finish (also called Mod Dash); IA = Information Architecture (Wireframes); MM = Marathon Match; Pr = UI Prototype; QA = Quality Assurance Competition; SDg = Software Design (also called Component Design, and just Design); SRM = Algorithm.
  2. ^ Topcoder member nicknames are given in italic
  3. ^ Officially titled 2001 TopCoder Invitational
  4. ^ Officially titled 2002 TopCoder Invitational
  5. ^ Officially titled 2003 TopCoder Open Sponsored by Intel
  6. ^ Officially titled 2004 TopCoder Open Sponsored by Microsoft
  7. ^ Officially titled 2005 TopCoder Open Sponsored by Sun Microsystems
  8. ^ Officially titled 2005 TopCoder Open Sponsored by AMD
  9. ^ Officially titled 2007 TopCoder Open Sponsored by AOL
  10. ^ Software development competition that year was online-only, and it was divided into Architecture, Assembly, Component Design, Component Development, and Specification sub-tracks.
  11. ^ a b In 2015, on-site finals for UI Design and UI Prototype competitions where held at TCO15 Yogyakarta event; and other on-site finals: Competitive Progamming (SMR), Information Architecture, Marathon Match, Software Development were held at TCO15 Indianapolis event.
  12. ^ Update till TCO17, inclusive
  13. ^ Topcoder member nicknames are given in italic
  14. ^ Officially titled 2001 TopCoder Collegiate Challenge
  15. ^ a b Officially titled Sun Microsystems TopCoder Collegiate Challenge
  16. ^ Officially titled 2004 Topcoder Collegiate Challenge Sponsored by Yahoo!
  17. ^ Officially titled 2005 TopCoder Collegiate Challenge Sponsored by Yahoo!
  18. ^ Officially titled 2006 TopCoder Collegiate Challenge Sponsored by AOL
  19. ^ Officially titled 2007 TopCoder High School
  20. ^ Individual and team competition

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  53. ^ "Topcoder Open 2015 - St. Petersburg (Russia) regional event". Retrieved April 16, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  54. ^ "TCO15 Regional Event - St. Petersburg, Russia". Retrieved April 16, 2018. {{cite news}}: Cite has empty unknown parameter: |dead-url= (help)
  55. ^ "Topcoder Open 2015 - Tokyo (Japan) regional event". Retrieved April 16, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  56. ^ "Topcoder Open 2015 - Jaipur (India) regional event". Retrieved April 16, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  57. ^ "Top Programmers and Designers Travel to Compete in the 2015 Topcoder Open India Regional Event". Appirio Newsroom. August 20, 2015. Retrieved April 23, 2018.
  58. ^ "Topcoder Open 2016 - Beijing". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  59. ^ "Topcoder Open 2016 - NYC". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  60. ^ "Topcoder Open 2016 - Jaipur". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  61. ^ "Topcoder Open 2016 - Yogyakarta". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  62. ^ "Topcoder Open 2016 - St. Petersburg". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  63. ^ "Topcoder Open 2017 - Austin (TX, USA) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  64. ^ "Topcoder Open 2017 - St. Petersburg (Russia) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  65. ^ "Topcoder Open 2017 - Beijing (China) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  66. ^ "Topcoder Open 2017 - Yogyakarta (Indonesia) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  67. ^ "Topcoder Open 2017 - Bangalore (India) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  68. ^ "Topcoder Open 2017 - Warsaw (Poland) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  69. ^ "Topcoder Open 2017 - Pittsburgh (PA, USA) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  70. ^ "Topcoder Open 2018 - Warsaw (Poland) regional event". {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  71. ^ "Topcoder Open 2018 - Beijing (China) regional event". Retrieved April 16, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  72. ^ "Topcoder Open 2018 - Bangalore Event". Topcoder Open. Retrieved July 9, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  73. ^ "Topcoder Open 2018 - Buenos Aires event". Topcoder Open 2018. Retrieved July 9, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  74. ^ "2018 Topcoder Open, Yogyakarta regional event". 2018 Topcoder Open. Retrieved September 8, 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  75. ^ Suryana, Wahyu (August 16, 2018). "Amikom Jaga Tradisi Juara di Top Coder Open". Republica. Retrieved September 24, 2018.
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