Problems from 2015 Southeast USA Regionals Division 1

Name
Fastest
Shortest
Authors
Full Solves
Ratio
Difficulty
Languages
Airports0.1280833126179%5.4Mediumen
Checkers0.00830924145%9.0Harden
Coverage0.041375443170%6.1Harden
Gears0.0049124821587%3.5Mediumen
Grid0.012253254285588%1.9Easyen
Hilbert Sort0.043891007676%6.3Harden
Racing Gems0.03298796076%6.7Harden
Simplicity0.00411548132886%2.4Easyen
Weightlifting0.00127705984%4.5Mediumen