Problems from 2013 ACM-ICPC North American Qualifier

Languages
4 thought0.0011517208568833%3.2Mediumen
Biggest Slice0.00365135534025%6.2Harden
Erratic Ants0.00581173751430%4.9Mediumen
Even Up Solitaire0.00648725351540%2.4Easyen
Goldbach's Conjecture0.001286539265341%2.2Easyen
Island Buses0.00137578222729%6.9Harden
Oddities0.0013405552164353%1.4Easyen
Plotting Polynomials0.0019354239673%2.4Easyen
Shotcube0.1719044306315%8.5Harden
Ternarian Weights0.00218193764133%4.0Mediumen
Trapezoid Walkway0.0045168335552%3.5Mediumen