[pykello]

It took them cumulative practice of at least 19 years to reach there.

(One of them started practicing 10 years ago [1]. The two other are active at topcoder since 2010 [2] and 2011 [3]).

[1] http://en.wikipedia.org/wiki/Gennady_Korotkevich

[2] http://community.topcoder.com/tc?module=MemberProfile&cr=229...

[3] http://community.topcoder.com/tc?module=MemberProfile&cr=230...

[mkcarlos]

Gennady Korotkevich a.k.a "tourist" - I heard this name about ~5 years ago among my friends who are into competitive programming. Only learned of his name today. It's impressive how good he is at such a young age.