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.
Number of 1s in the Binary Representation of a Number
The Tower of Hanoi
fly fly away
Sum the Digits of a Number
Bridge and Torch Problem - Minimum time
Bridge and Torch Problem - Length of Unique Time List
Fill the matrix - 1
Simple return on investment
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