Problems from 2015 Southeast USA Regionals Division 1

Name
Fastest
Shortest
Authors
Full Solves
Ratio
Difficulty
Languages
Airports0.1280833126179%5.4Mediumen
Checkers0.00830944346%8.9Harden
Coverage0.041375433070%6.1Harden
Gears0.0049124621487%3.5Mediumen
Grid0.012253279287488%2.0Easyen
Hilbert Sort0.043891017877%6.2Harden
Racing Gems0.03298785976%6.7Harden
Simplicity0.00411551133186%2.4Easyen
Weightlifting0.00127705984%4.5Mediumen