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'''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. Each year, the most successful participants of each competition track included into TCO are selected and invited for a free one-week trip to on-site finals, where they compete for prizes, and also socialize with each other, helping to build community sprit among the most active members. In the first two years, 2001 and 2002, the tournament was titled TopCoder Invitational.
In addition to the main chamionship, from 2001 to 2007 Topcoder was organizing an annual TopCoder Collegiate Challenge tournament, for college students only. Also from 2007 to 2010 TopCoder High School competition was held.
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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 Compeition (SRM)''' – 2001 - nowadays – 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:<ref>{{Cite
** ''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 descrease 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 sumitter 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.
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|- bgcolor="gold"
|Nov 10 - 14, 2013
|TCO13 (Washington DC, USA)<ref>{{Cite web|url=http://tccommunity.wpengine.com/tco13|title=Topcoder Open 2013|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=April 18, 2018}}</ref><ref>{{Cite
|Capital Hilton Hotel
|Dev, Dg, F2F, MM, SDg, SRM
|- bgcolor="gold"
|Nov 16 - 19, 2014
|TCO14 - San Francisco (CA, USA)
|Pier 48
|Dev, Dg, F2F, MM, SDg, SRM
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|Aug 22, 2015
|TCO15 - Jaipur (India)
|[[Manipal University Jaipur|Manipal University]]
|Dev, SRM
| |||