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.
Sum of first n terms of a harmonic progression
Calculate the area of a triangle between three points
Find out missing number from a vector of 9 elements
GJam: 2013 Rd1a Bullseye Painting
PACMAT - Ghosts maximize unique locations; 3 Lives
GJam 2016 Rd1A: Rank and File (Large)
Mastermind IV: Optimal Solver - max of 5 guesses
GJam 2013 Veterans: Ocean View (Large)
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