Given a matrix, find the cofactor of the element in 'i'th row and 'j'th column.
I think that there is an error on test case numbe 1. http://en.wikipedia.org/wiki/Cofactor_(linear_algebra)
Please correct test case 1.
I believe the answer here should be -3, not 6.
Back to basics 23 - Triangular matrix
Compute a dot product of two vectors x and y
Returning a "greater than" vector
Length of a short side
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