This is (more or less) cribbed from the USC contest winner's solution.
Very fast and very compact solution. Nice usage of complex to calculate distance between points and recursion.
Filter AC, pass DC
Volume of a sphere given its surface area
GJam 2013 China Event: Happy Teams 100 Pairs
PACMAT 06 - Optimized Ghosts, Equal Speed, Inf Lives; Interactive Download
USC Fall 2012 ACM: Driving the Rover
Image Processing 002 : Fix Vignetting in a Visible Sensor
Spherical radius given four points
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