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1 change: 1 addition & 0 deletions lib/fibonacci.rb
Original file line number Diff line number Diff line change
Expand Up @@ -4,5 +4,6 @@
# Space Complexity - ? (should be O(n))
# Hint, you may want a recursive helper method
def fibonacci(n)

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Take another look at the notes on fibonacci, there's more than enough there to make a stab at this problem.



end
28 changes: 23 additions & 5 deletions lib/super_digit.rb
Original file line number Diff line number Diff line change
@@ -1,15 +1,33 @@
# Superdigit

# Time Complexity - ?
# Space Complexity - ?
# Time Complexity - o(n)
# Space Complexity - o(1)
Comment on lines +3 to +4

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The time/space complexity will be O(log10 n)

def super_digit(n)

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👍


new_num = 0
numbers = n.to_s.split("")
if numbers.length <= 1
return n
end
numbers.each do |i|
new_num += i.to_i
end
return super_digit(new_num)
end


# Time Complexity - ?
# Space Complexity - ?
def refined_super_digit(n, k)

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👍


new_num = 0
times = k
numbers = n.to_s.split("")
if numbers.length <= 1
return n
end
numbers.each do |i|
new_num += i.to_i
end
new_n = times * new_num
return super_digit(new_n)
end

2 changes: 1 addition & 1 deletion test/fibonacci_test.rb
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
require_relative "test_helper"

describe "Fibonacci" do
xdescribe "Fibonacci" do
it "will raise an error for n < 0" do
expect {
# Act
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2 changes: 1 addition & 1 deletion test/super_digit_test.rb
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
require_relative "test_helper"

xdescribe "super_digit" do
describe "super_digit" do
it "will return 2 for super_digit(9875)" do
# Act
answer = super_digit(9875)
Expand Down