TCO16 Marathon Round 1 CutTheRoots started today. It will run for 2 weeks, the top 2 participants will advance to the finals, and the top 15 will get t-shirts! The idea of the problem is mine, and implementation was done by JacoCronje.

UPD. TopCoder added 2 more spots in the finals! They will go to people who 1) didn't advance to the finals via standard route, 2) took part in all three online rounds and 3) have the lowest sum of ranks in the three rounds.