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Added notebook solving the following: Implement a linked list with insert, find (coming soon), delete (coming soon), and print methods.
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Donne Martin
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@ -11,6 +11,10 @@ Continually updated IPython Notebooks containing algorithms and data structures.
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* [Encode spaces in a string in-place](http://nbviewer.ipython.org/github/donnemartin/algorithms-data-structures/blob/master/arrays-strings/replace_char.ipynb)
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* [Compress a string](http://nbviewer.ipython.org/github/donnemartin/algorithms-data-structures/blob/master/arrays-strings/compress.ipynb)
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## Linked Lists
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* [Linked list with insert, find, delete, and print methods](http://nbviewer.ipython.org/github/donnemartin/algorithms-data-structures/blob/master/linked-lists/linked-list.ipynb)
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## License
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Copyright 2015 Donne Martin
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217
linked-lists/linked-list.ipynb
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217
linked-lists/linked-list.ipynb
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@ -0,0 +1,217 @@
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Problem: Implement a linked list with insert, find, delete, and print methods.\n",
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"\n",
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"* [Clarifying Questions](#Clarifying-Questions)\n",
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"* [Test Cases](#Test-Cases)\n",
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"* [Algorithm](#Algorithm)\n",
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"* [Code](#Code)\n",
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"* [Pythonic-Code](#Pythonic-Code)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Clarifying Questions\n",
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"\n",
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"* Is this a singly or doubly linked list?\n",
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" * Singly\n",
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"* Is this a circular list?\n",
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" * No\n",
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"* Do we keep track of the tail or just the head?\n",
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" * Just the head\n",
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"* Can you insert NULL values in the list?\n",
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" * No"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Test Cases\n",
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"\n",
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"### Insert to Front\n",
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"\n",
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"* Insert a NULL\n",
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"* Insert in an empty list\n",
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"* Insert in a list with one element or more elements\n",
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"\n",
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"### Find\n",
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"\n",
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"* Coming soon\n",
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"\n",
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"### Delete\n",
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"\n",
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"* Coming soon\n",
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"\n",
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"### Print\n",
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"\n",
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"* Print an empty list\n",
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"* Print a list with one or more elements"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Algorithm\n",
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"\n",
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"### Insert to Front\n",
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"\n",
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"* If the data we are inserting is NULL, return\n",
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"* Create a node with the input data\n",
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"* If this is an empty list\n",
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" * Assign the head to the node\n",
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"* Else\n",
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" * Set the node.next to the head\n",
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" * Set the head to the node\n",
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"\n",
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"Complexity:\n",
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"* Time: O(1)\n",
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"* Space: O(1), a new node is added\n",
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"\n",
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"### Find\n",
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"\n",
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"* Coming soon\n",
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"\n",
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"Complexity:\n",
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"* Time: O(n)\n",
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"* Space: In-place\n",
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"\n",
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"### Delete\n",
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"\n",
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"* Coming soon\n",
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"\n",
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"Complexity:\n",
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"* Time: O(n)\n",
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"* Space: In-place\n",
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"\n",
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"### Print\n",
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"\n",
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"* For each node\n",
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" * Print the node's value\n",
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" \n",
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"Complexity:\n",
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"* Time: O(n)\n",
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"* Space: In-place"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Code"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 19,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"class Node(object):\n",
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" def __init__(self, data):\n",
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" self.next = None\n",
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" self.data = data\n",
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" \n",
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" def __str__(self):\n",
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" return self.data\n",
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"\n",
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"class LinkedList(object):\n",
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" def __init__(self, head):\n",
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" self.head = head\n",
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"\n",
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" def insert_to_front(self, data):\n",
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" if data is None:\n",
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" return\n",
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" node = Node(data)\n",
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" if self.head is None:\n",
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" self.head = node\n",
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" else:\n",
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" node.next = self.head\n",
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" self.head = node\n",
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"\n",
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" def print_list(self):\n",
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" curr_node = self.head\n",
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" while curr_node is not None:\n",
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" print(curr_node.data)\n",
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" curr_node = curr_node.next"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 30,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"10\n",
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"10\n",
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"bc\n",
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"a\n",
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"10\n"
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]
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}
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],
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"source": [
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"# Test insert_to_front\n",
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"# Insert in an empty list\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.insert_to_front(10)\n",
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"linked_list.print_list()\n",
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"# Insert a NULL\n",
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"linked_list.insert_to_front(None)\n",
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"linked_list.print_list()\n",
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"# Insert in a list with one element or more elements\n",
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"linked_list.insert_to_front('a')\n",
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"linked_list.insert_to_front('bc')\n",
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"linked_list.print_list()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 31,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"# Test empty print\n",
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"linked_list = LinkedList(None)\n",
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"linked_list.print_list()"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.9"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}
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