mirror of
https://github.com/donnemartin/interactive-coding-challenges.git
synced 2024-03-22 13:11:13 +08:00
Add move zeroes challenge
This commit is contained in:
Donne Martin
parent
5b65a8a955
commit
22971b5005
0
online_judges/move_zeroes/__init__.py
Normal file
0
online_judges/move_zeroes/__init__.py
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189
online_judges/move_zeroes/move_zeroes_challenge.ipynb
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189
online_judges/move_zeroes/move_zeroes_challenge.ipynb
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@ -0,0 +1,189 @@
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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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"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)."
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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: Move all zeroes in a list to the end.\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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"* Is the input an array of ints?\n",
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" * Yes\n",
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"* Is the output a new array of ints?\n",
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" * No, do this in-place\n",
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"* Do we need to maintain ordering of non-zero values?\n",
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" * Yes\n",
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"* Can we assume the inputs are valid?\n",
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" * No\n",
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"* Can we assume this fits memory?\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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"<pre>\n",
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"* None -> TypeError\n",
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"* [0, 1, 0, 3, 12]\n",
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"* [1, 0] -> [1, 0]\n",
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"* [0, 1] -> [1, 0]\n",
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"* [0] -> [0]\n",
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"* [1] -> [1]\n",
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"* [1, 1] -> [1, 1]\n",
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"</pre>"
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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": 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 Solution(object):\n",
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"\n",
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" def move_zeroes(self, nums):\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"
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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": 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_move_zeroes.py\n",
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"from nose.tools import assert_equal, assert_raises\n",
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"\n",
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"\n",
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"class TestMoveZeroes(object):\n",
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"\n",
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" def test_move_zeroes(self):\n",
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" solution = Solution()\n",
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" assert_raises(TypeError, solution.move_zeroes, None)\n",
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" array = [0, 1, 0, 3, 12]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 3, 12, 0, 0])\n",
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" array = [1, 0]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 0])\n",
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" array = [0, 1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 0])\n",
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" array = [0]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [0])\n",
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" array = [1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1])\n",
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" array = [1, 1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 1])\n",
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" print('Success: test_move_zeroes')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestMoveZeroes()\n",
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" test.test_move_zeroes()\n",
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"\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 3",
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"language": "python",
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"name": "python3"
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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": 3
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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": "ipython3",
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"version": "3.5.0"
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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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250
online_judges/move_zeroes/move_zeroes_solution.ipynb
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250
online_judges/move_zeroes/move_zeroes_solution.ipynb
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@ -0,0 +1,250 @@
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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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"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)."
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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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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Problem: Move all zeroes in a list to the end.\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)"
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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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"* Is the input an array of ints?\n",
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" * Yes\n",
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"* Is the output a new array of ints?\n",
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" * No, do this in-place\n",
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"* Do we need to maintain ordering of non-zero values?\n",
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" * Yes\n",
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"* Can we assume the inputs are valid?\n",
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" * No\n",
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"* Can we assume this fits memory?\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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"<pre>\n",
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"* None -> TypeError\n",
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"* [0, 1, 0, 3, 12] -> [1, 3, 12, 0, 0]\n",
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"* [1, 0] -> [1, 0]\n",
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"* [0, 1] -> [1, 0]\n",
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"* [0] -> [0]\n",
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"* [1] -> [1]\n",
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"* [1, 1] -> [1, 1]\n",
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"</pre>"
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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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"* pos = 0\n",
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"* Loop through each item in the input\n",
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" * If the item != 0, set input[pos] = item\n",
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" * pos++\n",
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"* Fill input[pos:] with zeroes\n",
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"\n",
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"<pre>\n",
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" |\n",
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"[0, 1, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[0, 1, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 1, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 1, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 1, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 3, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 3, 0, 3, 12]\n",
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" ^\n",
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" |\n",
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"[1, 3, 12, 3, 12]\n",
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" ^\n",
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"\n",
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"Fill right with zeroes:\n",
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"\n",
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"[1, 3, 12, 3, 12]\n",
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" ^\n",
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"[1, 3, 12, 0, 12]\n",
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" ^\n",
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"[1, 3, 12, 0, 0]\n",
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" ^\n",
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"</pre>\n",
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"\n",
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"Complexity:\n",
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"* Time: O(n)\n",
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"* Space: O(1)"
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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": 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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"class Solution(object):\n",
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"\n",
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" def move_zeroes(self, nums):\n",
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" if nums is None:\n",
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" raise TypeError('nums cannot be None')\n",
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" pos = 0\n",
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" for num in nums:\n",
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" if num != 0:\n",
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" nums[pos] = num\n",
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" pos += 1\n",
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" if pos < len(nums):\n",
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" nums[pos:] = [0] * (len(nums) - pos)"
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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": "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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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Overwriting test_move_zeroes.py\n"
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]
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}
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],
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"source": [
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"%%writefile test_move_zeroes.py\n",
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"from nose.tools import assert_equal, assert_raises\n",
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"\n",
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"\n",
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"class TestMoveZeroes(object):\n",
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"\n",
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" def test_move_zeroes(self):\n",
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" solution = Solution()\n",
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" assert_raises(TypeError, solution.move_zeroes, None)\n",
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" array = [0, 1, 0, 3, 12]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 3, 12, 0, 0])\n",
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" array = [1, 0]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 0])\n",
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" array = [0, 1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 0])\n",
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" array = [0]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [0])\n",
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" array = [1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1])\n",
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" array = [1, 1]\n",
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" solution.move_zeroes(array)\n",
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" assert_equal(array, [1, 1])\n",
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" print('Success: test_move_zeroes')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestMoveZeroes()\n",
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" test.test_move_zeroes()\n",
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"\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": 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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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Success: test_move_zeroes\n"
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]
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}
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],
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"source": [
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"%run -i test_move_zeroes.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 3",
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"language": "python",
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"name": "python3"
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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": 3
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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": "ipython3",
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"version": "3.4.3"
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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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36
online_judges/move_zeroes/test_move_zeroes.py
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36
online_judges/move_zeroes/test_move_zeroes.py
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@ -0,0 +1,36 @@
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from nose.tools import assert_equal, assert_raises
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class TestMoveZeroes(object):
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def test_move_zeroes(self):
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solution = Solution()
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assert_raises(TypeError, solution.move_zeroes, None)
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array = [0, 1, 0, 3, 12]
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solution.move_zeroes(array)
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assert_equal(array, [1, 3, 12, 0, 0])
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array = [1, 0]
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solution.move_zeroes(array)
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assert_equal(array, [1, 0])
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array = [0, 1]
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solution.move_zeroes(array)
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assert_equal(array, [1, 0])
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array = [0]
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solution.move_zeroes(array)
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assert_equal(array, [0])
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array = [1]
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solution.move_zeroes(array)
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assert_equal(array, [1])
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array = [1, 1]
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solution.move_zeroes(array)
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assert_equal(array, [1, 1])
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print('Success: test_move_zeroes')
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def main():
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test = TestMoveZeroes()
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test.test_move_zeroes()
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if __name__ == '__main__':
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main()
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