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.
Replace NaNs with the number that appears to its left in the row.
Number of Circles in a Number
07 - Common functions and indexing 5
Find nth maximum
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