Spookily similar to Problem 381 ("Angle between two vectors")....
Distance walked 2D
Sum of diagonal of a square matrix
Test if two numbers have the same digits
Extra safe primes
Text File Read: 64 bit data set
Criss-Cross: NHL - Optimize Matrix Size
REPMAT Enhancement - Faster for Large Row Replication of Vector
GJam: 2013 Rd1a Bullseye Painting
Kaggle: Reverse Game of Life - Single Move to One Cell Case
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