mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
Add str diff challenge
This commit is contained in:
Donne Martin
parent
c9574ae7fd
commit
4ebb379eea
0
online_judges/str_diff/__init__.py
Normal file
0
online_judges/str_diff/__init__.py
Normal file
165
online_judges/str_diff/str_diff_challenge.ipynb
Normal file
165
online_judges/str_diff/str_diff_challenge.ipynb
Normal file
|
|
@ -0,0 +1,165 @@
|
|||
{
|
||||
"cells": [
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"# Challenge Notebook"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Problem: Find the Difference.\n",
|
||||
"\n",
|
||||
"See the [LeetCode](https://leetcode.com/problems/find-the-difference/) problem page.\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",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Constraints\n",
|
||||
"\n",
|
||||
"* Can we assume the strings are ASCII?\n",
|
||||
" * Yes\n",
|
||||
"* Is case important?\n",
|
||||
" * The strings are lower case\n",
|
||||
"* Can we assume the inputs are valid?\n",
|
||||
" * No, check for None\n",
|
||||
"* Can we assume this fits memory?\n",
|
||||
" * Yes"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Test Cases\n",
|
||||
"\n",
|
||||
"* None input -> TypeError\n",
|
||||
"* 'aaabbcdd', 'abdbacade' -> 'e'"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Algorithm\n",
|
||||
"\n",
|
||||
"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."
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Code"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": null,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"class Solution(object):\n",
|
||||
"\n",
|
||||
" def find_diff(self, s, t):\n",
|
||||
" # TODO: Implement me\n",
|
||||
" pass"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Unit Test"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"**The following unit test is expected to fail until you solve the challenge.**"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": null,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"# %load test_str_diff.py\n",
|
||||
"from nose.tools import assert_equal, assert_raises\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"class TestFindDiff(object):\n",
|
||||
"\n",
|
||||
" def test_find_diff(self):\n",
|
||||
" solution = Solution()\n",
|
||||
" assert_raises(TypeError, solution.find_diff, None)\n",
|
||||
" assert_equal(solution.find_diff('aaabbcdd', 'abdbacade'), 'e')\n",
|
||||
" print('Success: test_find_diff')\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"def main():\n",
|
||||
" test = TestFindDiff()\n",
|
||||
" test.test_find_diff()\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"if __name__ == '__main__':\n",
|
||||
" main()"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Solution Notebook\n",
|
||||
"\n",
|
||||
"Review the [Solution Notebook]() for a discussion on algorithms and code solutions."
|
||||
]
|
||||
}
|
||||
],
|
||||
"metadata": {
|
||||
"kernelspec": {
|
||||
"display_name": "Python 3",
|
||||
"language": "python",
|
||||
"name": "python3"
|
||||
},
|
||||
"language_info": {
|
||||
"codemirror_mode": {
|
||||
"name": "ipython",
|
||||
"version": 3
|
||||
},
|
||||
"file_extension": ".py",
|
||||
"mimetype": "text/x-python",
|
||||
"name": "python",
|
||||
"nbconvert_exporter": "python",
|
||||
"pygments_lexer": "ipython3",
|
||||
"version": "3.5.0"
|
||||
}
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 0
|
||||
}
|
||||
195
online_judges/str_diff/str_diff_solution.ipynb
Normal file
195
online_judges/str_diff/str_diff_solution.ipynb
Normal file
|
|
@ -0,0 +1,195 @@
|
|||
{
|
||||
"cells": [
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"# Solution Notebook"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Problem: Find the Difference.\n",
|
||||
"\n",
|
||||
"See the [LeetCode](https://leetcode.com/problems/find-the-difference/) problem page.\n",
|
||||
"\n",
|
||||
"* [Constraints](#Constraints)\n",
|
||||
"* [Test Cases](#Test-Cases)\n",
|
||||
"* [Algorithm](#Algorithm)\n",
|
||||
"* [Code](#Code)\n",
|
||||
"* [Unit Test](#Unit-Test)"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Constraints\n",
|
||||
"\n",
|
||||
"* Can we assume the strings are ASCII?\n",
|
||||
" * Yes\n",
|
||||
"* Is case important?\n",
|
||||
" * The strings are lower case\n",
|
||||
"* Can we assume the inputs are valid?\n",
|
||||
" * No, check for None\n",
|
||||
"* Can we assume this fits memory?\n",
|
||||
" * Yes"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Test Cases\n",
|
||||
"\n",
|
||||
"* None input -> TypeError\n",
|
||||
"* 'aaabbcdd', 'abdbacade' -> 'e'"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Algorithm\n",
|
||||
"\n",
|
||||
"* Keep a dictionary of seen values in s\n",
|
||||
"* Loop through t, decrementing the seen values\n",
|
||||
" * If the char is not there or if the decrement results in a negative value, return the char\n",
|
||||
"\n",
|
||||
"Complexity:\n",
|
||||
"* Time: O(m+n), where m and n are the lengths of s, t\n",
|
||||
"* Space: O(h), for the dict, where h is the unique chars in s"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Code"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 1,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [],
|
||||
"source": [
|
||||
"class Solution(object):\n",
|
||||
"\n",
|
||||
" def find_diff(self, s, t):\n",
|
||||
" if s is None or t is None:\n",
|
||||
" raise TypeError('s or t cannot be None')\n",
|
||||
" seen = {}\n",
|
||||
" for char in s:\n",
|
||||
" if char in seen:\n",
|
||||
" seen[char] += 1\n",
|
||||
" else:\n",
|
||||
" seen[char] = 1\n",
|
||||
" for char in t:\n",
|
||||
" try:\n",
|
||||
" seen[char] -= 1\n",
|
||||
" except KeyError:\n",
|
||||
" return char\n",
|
||||
" if seen[char] < 0:\n",
|
||||
" return char\n",
|
||||
" return None"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "markdown",
|
||||
"metadata": {},
|
||||
"source": [
|
||||
"## Unit Test"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 2,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"Overwriting test_str_diff.py\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"%%writefile test_str_diff.py\n",
|
||||
"from nose.tools import assert_equal, assert_raises\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"class TestFindDiff(object):\n",
|
||||
"\n",
|
||||
" def test_find_diff(self):\n",
|
||||
" solution = Solution()\n",
|
||||
" assert_raises(TypeError, solution.find_diff, None)\n",
|
||||
" assert_equal(solution.find_diff('aaabbcdd', 'abdbacade'), 'e')\n",
|
||||
" print('Success: test_find_diff')\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"def main():\n",
|
||||
" test = TestFindDiff()\n",
|
||||
" test.test_find_diff()\n",
|
||||
"\n",
|
||||
"\n",
|
||||
"if __name__ == '__main__':\n",
|
||||
" main()"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 3,
|
||||
"metadata": {
|
||||
"collapsed": false
|
||||
},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"Success: test_find_diff\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"%run -i test_str_diff.py"
|
||||
]
|
||||
}
|
||||
],
|
||||
"metadata": {
|
||||
"kernelspec": {
|
||||
"display_name": "Python 3",
|
||||
"language": "python",
|
||||
"name": "python3"
|
||||
},
|
||||
"language_info": {
|
||||
"codemirror_mode": {
|
||||
"name": "ipython",
|
||||
"version": 3
|
||||
},
|
||||
"file_extension": ".py",
|
||||
"mimetype": "text/x-python",
|
||||
"name": "python",
|
||||
"nbconvert_exporter": "python",
|
||||
"pygments_lexer": "ipython3",
|
||||
"version": "3.5.0"
|
||||
}
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 0
|
||||
}
|
||||
19
online_judges/str_diff/test_str_diff.py
Normal file
19
online_judges/str_diff/test_str_diff.py
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
from nose.tools import assert_equal, assert_raises
|
||||
|
||||
|
||||
class TestFindDiff(object):
|
||||
|
||||
def test_find_diff(self):
|
||||
solution = Solution()
|
||||
assert_raises(TypeError, solution.find_diff, None)
|
||||
assert_equal(solution.find_diff('aaabbcdd', 'abdbacade'), 'e')
|
||||
print('Success: test_find_diff')
|
||||
|
||||
|
||||
def main():
|
||||
test = TestFindDiff()
|
||||
test.test_find_diff()
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Loading…
Reference in New Issue
Block a user