I will suggest the following as the top four

• Geometry

• Mathematics

• Calculus

• Dynamic Programming

What do you think ? you can suggest too.

Let's try predicting IOI 2016 Results top 5 from the link

http://mirror.codeforces.com/blog/entry/44179

I'll give top five to

• Ce Jin jcvb from China (First Participation)

• AmirMohammed Dehghan PrinceOfPersia from Iran (First Participation)

• Hristo Venev mustrumr from Bulgaria (2015-Gold, 2014-Gold, 2013-Gold, 2012-Silver)

• Daniel Chiu waterfalls from United States of America (2015-Gold)

• Yuta Takaya yutaka1999 from Japan (2014 gold,2015 gold)

and me as six... LOL!! can you suggest more

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