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https://github.com/donnemartin/interactive-coding-challenges
synced 2026-03-04 14:48:45 +00:00
Added linked list challenge.
This commit is contained in:
Donne Martin
331
linked_lists/linked_list/linked_list_challenge.ipynb
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331
linked_lists/linked_list/linked_list_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: Implement a linked list with insert, append, find, delete, length, and print methods\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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"* 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"
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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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"### Append\n",
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"\n",
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"* Append a NULL\n",
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"* Append 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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"* Find a NULL\n",
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"* Find in an empty list\n",
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"* Find in a list with one element or more matching elements\n",
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"* Find in a list with no matches\n",
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"\n",
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"### Delete\n",
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"\n",
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"* Delete a NULL\n",
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"* Delete in an empty list\n",
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"* Delete in a list with one element or more matching elements\n",
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"* Delete in a list with no matches\n",
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"\n",
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"### Length\n",
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"\n",
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"* Length of zero or more elements\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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"Refer to the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/coding-challenges/blob/master/linked_lists/linked_list/linked_list_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": 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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" \n",
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" def __init__(self, data, next_node=None):\n",
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" pass\n",
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" # TODO: Implement me\n",
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" \n",
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" def __str__(self):\n",
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" pass\n",
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" # TODO: Implement me\n",
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"\n",
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"class LinkedList(object):\n",
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" \n",
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" def __init__(self, head=None):\n",
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" pass\n",
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" # TODO: Implement me\n",
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"\n",
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" def __len__(self):\n",
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" pass\n",
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" # TODO: Implement me\n",
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" \n",
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" def insert_to_front(self, data):\n",
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" pass\n",
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" # TODO: Implement me\n",
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" \n",
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" def append(self, data, next_node=None):\n",
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" pass\n",
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" # TODO: Implement me\n",
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" \n",
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" def find(self, data):\n",
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" pass\n",
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" # TODO: Implement me\n",
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" \n",
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" def delete(self, data):\n",
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" pass\n",
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" # TODO: Implement me\n",
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"\n",
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" def print_list(self):\n",
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" pass\n",
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" # TODO: Implement me\n",
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"\n",
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" def get_all_data(self):\n",
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" pass\n",
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" # TODO: Implement me"
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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_linked_list.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 TestLinkedList(object):\n",
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" \n",
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" def test_insert_to_front(self):\n",
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" print('Test: insert_to_front on 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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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: insert_to_front on a NULL')\n",
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" linked_list.insert_to_front(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: insert_to_front general case')\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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" assert_equal(linked_list.get_all_data(), ['bc', 'a', 10])\n",
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" \n",
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" print('Success: test_insert_to_front\\n')\n",
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" \n",
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" def test_append(self):\n",
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" print('Test: append on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" linked_list.append(10)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: append a NULL')\n",
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" linked_list.append(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: append general case')\n",
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" linked_list.append('a')\n",
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" linked_list.append('bc')\n",
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" assert_equal(linked_list.get_all_data(), [10, 'a', 'bc'])\n",
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" \n",
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" print('Success: test_append\\n')\n",
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" \n",
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" def test_find(self):\n",
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" print('Test: find on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" node = linked_list.find('a')\n",
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" assert_equal(node, None)\n",
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"\n",
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" print('Test: find a NULL')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" node = linked_list.find(None)\n",
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" assert_equal(node, None)\n",
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"\n",
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" print('Test: find general case with matches')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\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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" node = linked_list.find('a')\n",
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" assert_equal(str(node), 'a')\n",
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"\n",
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" print('Test: find general case with no matches')\n",
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" node = linked_list.find('aaa')\n",
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" assert_equal(node, None)\n",
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" \n",
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" print('Success: test_find\\n')\n",
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" \n",
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" def test_delete(self):\n",
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" print('Test: delete on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" linked_list.delete('a')\n",
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" assert_equal(linked_list.get_all_data(), [])\n",
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"\n",
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" print('Test: delete a NULL')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\n",
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" linked_list.delete(None)\n",
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" assert_equal(linked_list.get_all_data(), [10])\n",
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"\n",
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" print('Test: delete general case with matches')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\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.delete('a')\n",
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" assert_equal(linked_list.get_all_data(), ['bc', 10])\n",
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"\n",
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" print('Test: delete general case with no matches')\n",
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" linked_list.delete('aa')\n",
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" assert_equal(linked_list.get_all_data(), ['bc', 10])\n",
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" \n",
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" print('Success: test_delete\\n')\n",
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" \n",
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" def test_len(self):\n",
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" print('Test: len on an empty list')\n",
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" linked_list = LinkedList(None)\n",
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" assert_equal(len(linked_list), 0)\n",
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"\n",
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" print('Test: len general case')\n",
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" head = Node(10)\n",
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" linked_list = LinkedList(head)\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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" assert_equal(len(linked_list), 3)\n",
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" \n",
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" print('Success: test_len\\n')\n",
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"\n",
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"def main():\n",
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" test = TestLinkedList()\n",
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" test.test_insert_to_front()\n",
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" test.test_append()\n",
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" test.test_find()\n",
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" test.test_delete()\n",
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" test.test_len()\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/linked_list/linked_list_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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