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.
chance in percent for minimum K heads when a good coin is tossed N times?
Back to basics 22 - Rotate a matrix
Sum the entries of each column of a matrix which satisfy a logical condition.
Minimum Distance between two N-sided Polygons
Solve Rubik's Cube - One Rotation
Sokoban: Puzzle 10.45
Make a Pandiagonal Prime Magic Square: 11 x 11
Knot Count - Speed
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