Spot the rectangle
Getting the absolute index from a matrix
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Set some matrix elements to zero
Center of mass
GJam 2014 China Rd A: Rational Number Tree
Rubik's Cube: 30 Moves or Less: Minimum Avg Time
Top of the Hour : Return from your routine within 1 second of the hour
Unique: Faster 'rows' for large array of uint8
Usage of java.math : Add, Multiply, Pow
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