Return double factorial
n(n-2)...(5)(3)(1), n>0, odd
n!! = n(n-2)...(6)(4)(2), n>0, even
1 , n = -1, or n = 0
6!! = (6)(4)(2) = 48
Neither n = -1, nor n = 0 are tested.
Finding Perfect Squares
Basic arrays operations.
Matrix Construction I
Bridge and Torch Problem - Length of Unique Time List
Determine if input is a valid AHP evaluation matrix
Fill the matrix - 1
Integer to boolean
Repeat string n times - 2
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