this solution packs all 240 boxes (99.1% efficiency); Rather than entering as many boxes as possible in each level, in the actual contest I used a somewhat more convoluted strategy that attempted to condition the box heights so that they would also pack nicely vertically across sequential levels, but the 2d-packing solver works just as well for these simpler "unconstrained" cases. Here (http://www.kaggle.com/c/packing-santas-sleigh/forums/t/6934/how-d-you-do-it/38414#post38414) is a more detailed description of the method I used in that contest, and you may find a link to the solution code there (as well as in this solution) in case you are interested.
Finding Perfect Squares
Remove the polynomials that have positive real elements of their roots.
Implement a counter
Calculate Euler's phi function
Find a subset that divides the vector into equal halves
USC Fall 2012 ACM Question A : Read Input File
Spherical radius given four points
Spectral Distance - Speed Scoring
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