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https://github.com/donnemartin/interactive-coding-challenges
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Added remove duplicates challenge.
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Donne Martin
198
linked_lists/remove_duplicates/remove_duplicates_challenge.ipynb
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198
linked_lists/remove_duplicates/remove_duplicates_challenge.ipynb
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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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"<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://github.com/donnemartin/coding-challenges).</i></small>"
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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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"# Challenge Notebook"
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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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"## Problem: Remove duplicates from a linked list\n",
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"\n",
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"* [Constraints](#Constraints)\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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"* [Unit Test](#Unit-Test)\n",
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"* [Solution Notebook](#Solution-Notebook)"
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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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"## Constraints\n",
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"\n",
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"*Problem statements are sometimes ambiguous. Identifying constraints and stating assumptions can help to ensure you code the intended solution.*\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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"* Can you insert NULL values in the list?\n",
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" * No\n",
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"* Can you use additional data structures?\n",
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" * Implement both solutions\n",
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"* Can we assume we already have a linked list class that can be used for this problem?\n",
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" * Yes"
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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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"* Empty linked list -> []\n",
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"* One element linked list -> [element]\n",
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"* General case with no duplicates\n",
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"* General case with duplicates"
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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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"Refer to the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/coding-challenges/blob/master/linked_lists/remove_duplicates/remove_duplicates_solution.ipynb). If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start."
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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": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"%run ../linked_list/linked_list.py\n",
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"%load ../linked_list/linked_list.py"
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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": null,
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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 MyLinkedList(LinkedList):\n",
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" \n",
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" def remove_dupes(self):\n",
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" # TODO: Implement me\n",
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" pass"
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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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"## Unit Test"
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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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"\n",
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"\n",
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"**The following unit test is expected to fail until you solve the challenge.**"
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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": null,
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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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"# %load test_remove_duplicates.py\n",
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"from nose.tools import assert_equal\n",
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"\n",
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"\n",
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"class TestRemoveDupes(object):\n",
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" \n",
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" def test_remove_dupes(self, linked_list):\n",
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" print('Test: Empty list')\n",
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" linked_list.remove_dupes()\n",
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" assert_equal(linked_list.get_all_data(), [])\n",
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"\n",
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" print('Test: One element list')\n",
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" linked_list.insert_to_front(2)\n",
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" linked_list.remove_dupes()\n",
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" assert_equal(linked_list.get_all_data(), [2])\n",
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"\n",
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" print('Test: General case, duplicates')\n",
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" linked_list.insert_to_front(1)\n",
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" linked_list.insert_to_front(3)\n",
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" linked_list.insert_to_front(1)\n",
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" linked_list.insert_to_front(1)\n",
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" linked_list.remove_dupes()\n",
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" assert_equal(linked_list.get_all_data(), [1, 3, 2])\n",
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"\n",
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" print('Test: General case, no duplicates')\n",
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" linked_list.remove_dupes()\n",
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" assert_equal(linked_list.get_all_data(), [1, 3, 2])\n",
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" \n",
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" print('Success: test_remove_dupes\\n')\n",
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"\n",
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"def main():\n",
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" test = TestRemoveDupes()\n",
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" linked_list = MyLinkedList(None)\n",
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" test.test_remove_dupes(linked_list)\n",
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" \n",
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"if __name__ == '__main__':\n",
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" main()"
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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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"## Solution Notebook\n",
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"\n",
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"Review the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/coding-challenges/blob/master/linked_lists/remove_duplicates/remove_duplicates_solution.ipynb) for a discussion on algorithms and code solutions."
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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": "2.7.10"
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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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