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Ports - Shamira #35

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Ports - Shamira #35

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14 changes: 11 additions & 3 deletions lib/factorial.rb
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Original file line number Diff line number Diff line change
@@ -1,6 +1,14 @@
# Computes factorial of the input number and returns it
# Time complexity: ?
# Space complexity: ?
# Time complexity: ? O(n) - linear with n being the number input.
# Space complexity: ? O(n) with n being the number input for the factorial.
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Since you are not using an array or anything, the space complexity is O(1). If n gets bigger the amount of memory used doesn't increase.

def factorial(number)
raise NotImplementedError
if number == nil || number < 0
raise ArgumentError, "Need positive integer"
end
factorial = 1
while number >= 1
factorial *= number
number = number - 1
end
return factorial
end