Ports - Jessica #19
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Ports - Jessica #19
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CheezItMan
reviewed
Sep 3, 2019
| # Time Complexity: O(1) | ||
| # Space Complexity O(1) | ||
| def add_first(value) | ||
| @head = Node.new(value, @head) # i don't fully understand why next_node is @head |
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You're setting next_node to the old value of @head. So the new node links to the start of the old list.
| # printing things to try to trace what's happening | ||
| while current | ||
| puts "------------" | ||
| puts "temporary: #{temporary.data if temporary}" |
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| # method to reverse the singly linked list | ||
| # note: the nodes should be moved and not just the values in the nodes | ||
| # Time Complexity: O(n), where n is the length of the list | ||
| # Space Complexity: O(1)? |
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Since you're reversing in place yes it's O(1) in space complexity.
| def find_nth_from_end(n) | ||
| return nil if self.length - 1 < n | ||
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| self.get_at_index(self.length - 1 - n) |
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