Leaves - Yitgop #41
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Leaves - Yitgop #41
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CheezItMan
reviewed
Feb 23, 2020
| @@ -19,99 +19,228 @@ def initialize | |||
| # method to add a new node with the specific data value in the linked list | |||
| # insert the new node at the beginning of the linked list | |||
| def add_first(value) | |||
| @@ -19,99 +19,228 @@ def initialize | |||
| # method to add a new node with the specific data value in the linked list | |||
| # insert the new node at the beginning of the linked list | |||
| def add_first(value) | |||
| raise NotImplementedError | |||
| @head = Node.new(value, @head) | |||
| end | |||
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| # method to find if the linked list contains a node with specified value | |||
| # returns true if found, false otherwise | |||
| def search(value) | |||
| return true if checker.data == value | ||
| checker = checker.next | ||
| end | ||
| return false | ||
| end | ||
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| # method to return the max value in the linked list | ||
| # returns the data value and not the node | ||
| def find_max |
lib/linked_list.rb
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| end | ||
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| curr = @head | ||
| self.(length-1).times do |
There was a problem hiding this comment.
This has a typo
Suggested change
| self.(length-1).times do | |
| (self.length - 1).times do | |
| max = marker.data if marker.data > max | ||
| marker = marker.next | ||
| end | ||
| return max | ||
| end | ||
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| # method to return the min value in the linked list | ||
| # returns the data value and not the node | ||
| def find_min |
| @head = curr.next | ||
| else | ||
| previous.next = curr.next | ||
| end | ||
| end | ||
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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 | ||
| def reverse |
There was a problem hiding this comment.
This doesn't seem to work as you never change @head
| curr.next = prev | ||
| prev = curr | ||
| curr = temp | ||
| end | ||
| end | ||
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| ## Advanced Exercises | ||
| # returns the value at the middle element in the singly linked list | ||
| def find_middle_value |
| fast = fast.next.next | ||
| end | ||
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| return slow.data | ||
| end | ||
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| # find the nth node from the end and return its value | ||
| # assume indexing starts at 0 while counting to n | ||
| def find_nth_from_end(n) |
| fast = fast.next | ||
| end | ||
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| return slow.data | ||
| end | ||
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| # checks if the linked list has a cycle. A cycle exists if any node in the | ||
| # linked list links to a node already visited. | ||
| # returns true if a cycle is found, false otherwise. | ||
| def has_cycle |
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This doesn't quite work as the cycle doesn't have to connect the head to the tail, it could be a circle starting toward the end. Like if the last node points to the 2nd to last node.
| until curr.nil? | ||
| if value >= curr.data | ||
| new = Node.new(value,curr.next.next) | ||
| curr.next = new |
There was a problem hiding this comment.
You'll want to leave the loop when you add the new node.
Suggested change
| curr.next = new | |
| curr.next = new | |
| return |
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