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Sockets - Riyo #30

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Sockets - Riyo #30

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21 changes: 18 additions & 3 deletions lib/fibonacci.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,23 @@
# ....
# e.g. 6th fibonacci number is 8

# Time complexity: ?
# Space complexity: ?
# Time complexity: O(n) where n is the input number
# Space complexity: O(1) the number of variables is constant regardless of size of n
def fibonacci(n)
raise NotImplementedError
fibonacci_num = 0
prior_num = 0
current_num = 1

if !n || n < 0
raise ArgumentError
elsif n == 0 || n == 1
return n
else
(n-1).times do
fibonacci_num = prior_num + current_num
prior_num = current_num
current_num = fibonacci_num
end
return current_num
end
end