interactive-coding-challenges/arrays_strings/compress_alt/better_compress_challenge.ipynb
2016-06-12 23:06:12 -04:00

168 lines
4.0 KiB
Python

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"<small><i>This notebook was prepared by [hashhar](https://github.com/hashhar). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges).</i></small>"
]
},
{
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"source": [
"# Challenge Notebook"
]
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{
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"source": [
"## Problem: Compress a string such that 'AAABCCDDDD' becomes 'A3BCCD4'. Only compress the string if it saves space.\n",
"\n",
"* [Constraints](#Constraints)\n",
"* [Test Cases](#Test-Cases)\n",
"* [Algorithm](#Algorithm)\n",
"* [Code](#Code)\n",
"* [Unit Test](#Unit-Test)\n",
"* [Solution Notebook](#Solution-Notebook)"
]
},
{
"cell_type": "markdown",
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"## Constraints\n",
"\n",
"* Can we assume the string is ASCII?\n",
" * Yes\n",
" * Note: Unicode strings could require special handling depending on your language\n",
"* Is this case sensitive?\n",
" * Yes\n",
"* Can we use additional data structures? \n",
" * Yes\n",
"* Can we assume this fits in memory?\n",
" * Yes"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Test Cases\n",
"\n",
"* None -> None\n",
"* '' -> ''\n",
"* 'AABBCC' -> 'AABBCC'\n",
"* 'AAABCCDDDD' -> 'A3BCCD4'"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Algorithm\n",
"\n",
"Refer to the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/compress/compress_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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"metadata": {},
"source": [
"## Code"
]
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"source": [
"def compress_string(string):\n",
" # TODO: Implement me\n",
" pass"
]
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"metadata": {},
"source": [
"## Unit Test"
]
},
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"\n",
"\n",
"**The following unit test is expected to fail until you solve the challenge.**"
]
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"cell_type": "code",
"execution_count": null,
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"source": [
"# %load test_compress.py\n",
"from nose.tools import assert_equal\n",
"\n",
"\n",
"class TestCompress(object):\n",
"\n",
" def test_compress(self, func):\n",
" assert_equal(func(None), None)\n",
" assert_equal(func(''), '')\n",
" assert_equal(func('AABBCC'), 'AABBCC')\n",
" assert_equal(func('AAABCCDDDD'), 'A3BCCD4')\n",
" print('Success: test_compress')\n",
"\n",
"\n",
"def main():\n",
" test = TestCompress()\n",
" test.test_compress(compress_string)\n",
"\n",
"\n",
"if __name__ == '__main__':\n",
" main()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Solution Notebook\n",
"\n",
"Review the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/arrays_strings/compress/compress_solution.ipynb) for a discussion on algorithms and code solutions."
]
}
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