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.
Clockwise or Counterclockwise
Make a simplified barcode
Longest run of consecutive numbers
Arrange vector in ascending order
Replicate elements in vectors
Image Processing 002 : Fix Vignetting in a Visible Sensor
Compression: Encode and Decode
Top of the Hour : Return from your routine within 1 second of the hour
Geometry: Find Circle given 3 Non-Colinear Points
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