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.
Make a checkerboard matrix
Return a list sorted by number of occurrences
Reverse the Words (not letters) of a String
Matrix with different incremental runs
Arrange vector in ascending order
Vector Linear sum: (p1-m1)V1+(p2-m2)V2+...(pK-mk)Vk
Spherical radius given four points
Rubik's Cube: 30 Moves or Less : Contest Scoring (Time/Size/Moves)
Creation of 2D Sinc Surface
PONG 001: Player vs Wall, 4 Lives, Interactive download
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