mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
new challenge: reverse_words
This commit is contained in:
mag6367
parent
502c4d77e4
commit
a567898dab
0
arrays_strings/reverse_words/__init__.py
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0
arrays_strings/reverse_words/__init__.py
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155
arrays_strings/reverse_words/reverse_words_challenge.ipynb
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155
arrays_strings/reverse_words/reverse_words_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 Marco Guajardo. For license visit [github](https://github.com/donnemartin/interactive-coding-challenges) </i> </small>\n",
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"."
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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\n"
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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: Given a string of words, return a string with the words in reverse"
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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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"* [Constraits](#Constraint)\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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"* Can we assume the string is ASCII?\n",
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" * Yes\n",
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"* Is whitespace important?\n",
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" * no the whitespace does not change\n",
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"* Is this case sensitive?\n",
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" * yes\n",
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"* What if the string is empty?\n",
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" * return None\n",
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"* Is the order of words important?\n",
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" * yes\n"
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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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"* Empty string -> None\n",
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"* \"the sun is very hot\" -> \"eht nus si yrev toh\"\n"
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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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"* Refer to the [Solution](https://github.com/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/reverse_words/reverse_words_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": 21,
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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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"def reverse_words (S):\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\n",
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"<b> The following unit test is expected to fail until you solve challenge </b>"
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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": 1,
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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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"from nose.tools import assert_equal\n",
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"\n",
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"class UnitTest (object):\n",
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" def testReverseWords(self):\n",
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" assert_equal(func('the sun is hot'), 'eht nus si toh')\n",
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" assert_equal(func(''), None)\n",
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" assert_equal(func('123 456 789'), '321 654 987')\n",
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" assert_equal(func('magic'), 'cigam')\n",
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" print('Success: reverse_words')\n",
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" \n",
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"def main():\n",
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" test = UnitTest()\n",
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" test.testReverseWords()\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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"* Review the [Solution Notebook](https://github.com/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/reverse_words/reverse_words_solution.ipynb) for 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": "2.7.6"
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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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162
arrays_strings/reverse_words/reverse_words_solution.ipynb
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162
arrays_strings/reverse_words/reverse_words_solution.ipynb
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@ -0,0 +1,162 @@
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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 Marco Guajardo. For license visit [github](https://github.com/donnemartin/interactive-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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"# Solution notebook\n",
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"## Problem: Given a string of words, return a string with the words in reverse"
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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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"* [Constraits](#Constraint)\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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"* Can we assume the string is ASCII?\n",
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" * Yes\n",
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"* Is whitespace important?\n",
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" * no the whitespace does not change\n",
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"* Is this case sensitive?\n",
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" * yes\n",
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"* What if the string is empty?\n",
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" * return None\n",
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"* Is the order of words important?\n",
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" * yes\n",
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"\n"
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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: Split words into a list and reverse each word individually\n",
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"Steps:\n",
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"\n",
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"* Check if string is empty\n",
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"* If not empty, split the string into a list of words \n",
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"* For each word on the list\n",
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" * reverse the word\n",
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"* Return the string representation of the list\n",
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"\n",
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"Complexity:\n",
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"\n",
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"* Time complexity is O(n) where n is the number of chars.\n",
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"* Space complexity is O(n) where n is the number of chars. "
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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": 2,
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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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"def reverse_words(S):\n",
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" if len(S) is 0:\n",
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" return None\n",
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" \n",
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" words = S.split()\n",
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" for i in range (len(words)):\n",
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" words[i] = words[i][::-1]\n",
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" \n",
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" return \" \".join(words)"
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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": 4,
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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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"Overwriting reverse_words_solution.py\n"
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]
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}
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],
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"source": [
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"%%writefile reverse_words_solution.py\n",
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"from nose.tools import assert_equal\n",
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"\n",
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"class UnitTest (object):\n",
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" def testReverseWords(self, func):\n",
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" assert_equal(func('the sun is hot'), 'eht nus si toh')\n",
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" assert_equal(func(''), None)\n",
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" assert_equal(func('123 456 789'), '321 654 987')\n",
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" assert_equal(func('magic'), 'cigam')\n",
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" print('Success: reverse_words')\n",
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" \n",
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"def main():\n",
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" test = UnitTest()\n",
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" test.testReverseWords(reverse_words)\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": "code",
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"execution_count": 5,
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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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"Success: reverse_words\n"
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]
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}
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],
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"source": [
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"run -i reverse_words_solution.py"
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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": "2.7.6"
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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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16
arrays_strings/reverse_words/reverse_words_solution.py
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arrays_strings/reverse_words/reverse_words_solution.py
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@ -0,0 +1,16 @@
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from nose.tools import assert_equal
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class UnitTest (object):
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def testReverseWords(self, func):
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assert_equal(func('the sun is hot'), 'eht nus si toh')
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assert_equal(func(''), None)
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assert_equal(func('123 456 789'), '321 654 987')
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assert_equal(func('magic'), 'cigam')
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print('Success: reverse_words')
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def main():
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test = UnitTest()
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test.testReverseWords(reverse_words)
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if __name__=="__main__":
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main()
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Reference in New Issue
Block a user