mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
Added unique chars challenge.
This commit is contained in:
Donne Martin
parent
73ec41e427
commit
8ac0bd3f69
24
arrays_strings/unique_chars/test_unique_chars.py
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24
arrays_strings/unique_chars/test_unique_chars.py
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@ -0,0 +1,24 @@
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from nose.tools import assert_equal
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class TestUniqueChars(object):
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def test_unique_chars(self, func):
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assert_equal(func(''), True)
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assert_equal(func('foo'), False)
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assert_equal(func('bar'), True)
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print('Success: test_unique_chars')
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def main():
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test = TestUniqueChars()
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test.test_unique_chars(unique_chars)
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try:
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test.test_unique_chars(unique_chars_hash)
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test.test_unique_chars(unique_chars_inplace)
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except NameError:
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# Alternate solutions are only defined
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# in the solutions file
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pass
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if __name__ == '__main__':
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main()
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183
arrays_strings/unique_chars/unique_chars_challenge.ipynb
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183
arrays_strings/unique_chars/unique_chars_challenge.ipynb
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@ -0,0 +1,183 @@
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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 an algorithm to determine if a string has all unique characters\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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"* Can you assume the string is ASCII?\n",
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" * Yes\n",
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" * Note: Unicode strings could require special handling depending on your language\n",
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"* Can we assume this is case sensitive?\n",
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" * Yes\n",
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"* Can you use additional data structures?\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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"*It is important to identify and run through general and edge cases by hand.*\n",
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"\n",
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"* '' -> True\n",
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"* 'foo' -> False\n",
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"* 'bar' -> True"
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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](#). 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": 3,
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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 unique_chars(string):\n",
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" chars_set = set()\n",
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" for char in string:\n",
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" if char in chars_set:\n",
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" return False\n",
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" else:\n",
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" chars_set.add(char)\n",
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" return True"
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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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"**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": 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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"Success: test_unique_chars\n"
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]
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}
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],
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"source": [
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"# %load test_unique_chars.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 TestUniqueChars(object):\n",
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"\n",
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" def test_unique_chars(self, func):\n",
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" assert_equal(func(''), True)\n",
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" assert_equal(func('foo'), False)\n",
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" assert_equal(func('bar'), True)\n",
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" print('Success: test_unique_chars')\n",
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"\n",
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"def main():\n",
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" test = TestUniqueChars()\n",
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" test.test_unique_chars(unique_chars)\n",
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" try:\n",
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" test.test_unique_chars(unique_chars_hash)\n",
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" test.test_unique_chars(unique_chars_inplace)\n",
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" except NameError:\n",
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" # Alternate solutions are only defined\n",
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" # in the solutions file\n",
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" pass\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](#) 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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@ -4,7 +4,14 @@
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"cell_type": "markdown",
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"cell_type": "markdown",
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"metadata": {},
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"metadata": {},
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"source": [
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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://bit.ly/code-notes).</i></small>"
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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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"# Solution Notebook"
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]
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]
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},
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},
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{
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{
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@ -30,11 +37,13 @@
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"source": [
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"source": [
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"## Constraints\n",
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"## Constraints\n",
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"\n",
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"\n",
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"*Problem statements are often intentionally ambiguous. Identifying constraints and stating assumptions can help to ensure you code the intended solution.*\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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"\n",
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"* Can I assume the string is ASCII?\n",
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"* Can you assume the string is ASCII?\n",
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" * Yes\n",
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" * Yes\n",
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" * Note: Unicode strings could require special handling depending on your language\n",
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" * Note: Unicode strings could require special handling depending on your language\n",
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"* Can we assume this is case sensitive?\n",
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" * Yes\n",
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"* Can you use additional data structures? \n",
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"* Can you use additional data structures? \n",
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" * Yes"
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" * Yes"
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]
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]
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@ -185,15 +194,51 @@
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]
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]
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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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"cell_type": "code",
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"metadata": {},
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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 test_unique_chars.py\n"
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]
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}
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],
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"source": [
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"source": [
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"*It is important to identify and run through general and edge cases from the [Test Cases](#Test-Cases) section by hand. You generally will not be asked to write a unit test like what is shown below.*"
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"%%writefile test_unique_chars.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 TestUniqueChars(object):\n",
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"\n",
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" def test_unique_chars(self, func):\n",
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" assert_equal(func(''), True)\n",
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" assert_equal(func('foo'), False)\n",
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" assert_equal(func('bar'), True)\n",
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" print('Success: test_unique_chars')\n",
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"\n",
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"def main():\n",
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" test = TestUniqueChars()\n",
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" test.test_unique_chars(unique_chars)\n",
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" try:\n",
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" test.test_unique_chars(unique_chars_hash)\n",
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" test.test_unique_chars(unique_chars_inplace)\n",
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" except NameError:\n",
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" # Alternate solutions are only defined\n",
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" # in the solutions file\n",
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" pass\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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},
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{
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{
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"cell_type": "code",
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"cell_type": "code",
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"execution_count": 4,
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"execution_count": 5,
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"metadata": {
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"metadata": {
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"collapsed": false
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"collapsed": false
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},
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},
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@ -209,20 +254,7 @@
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}
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}
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],
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],
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"source": [
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"source": [
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"from nose.tools import assert_equal\n",
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"%run -i test_unique_chars.py"
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"\n",
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"class Test(object):\n",
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" def test_unique_chars(self, func):\n",
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" assert_equal(func(''), True)\n",
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" assert_equal(func('foo'), False)\n",
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" assert_equal(func('bar'), True)\n",
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" print('Success: test_unique_chars')\n",
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"\n",
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"if __name__ == '__main__':\n",
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" test = Test()\n",
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" test.test_unique_chars(unique_chars)\n",
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" test.test_unique_chars(unique_chars_hash)\n",
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" test.test_unique_chars(unique_chars_inplace)"
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]
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]
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}
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}
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],
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],
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