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UPCOMING CHALLENGES:
CURRENT CHALLENGES:
Neon 2014
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Fluorum 2014
Oxygenium 2014
Nitrogenium 2013
Carbo 2013
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Psi 2012
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Sigma 2012
Rho 2012
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Omicron 2012
Xi 2012
Nu 2011
Mu 2011
Lambda 2011
Kappa 2011
Iota 2011
Theta 2011
Eta 2011
Zeta 2011
Epsilon 2011
Delta 2011
Gamma 2011
December 2010
PrefixSet edition (2010-10)
Eta 2011
Start date: May 27, 2011, midnight UTC
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Check whether a given sequence is a valid traversal of some ternary undirected tree.
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