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https://github.com/donnemartin/interactive-coding-challenges.git
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Add merge ranges challenge
This commit is contained in:
Donne Martin
parent
22971b5005
commit
f2587dc29b
0
online_judges/merge_ranges/__init__.py
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0
online_judges/merge_ranges/__init__.py
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188
online_judges/merge_ranges/merge_ranges_challenge.ipynb
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188
online_judges/merge_ranges/merge_ranges_challenge.ipynb
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@ -0,0 +1,188 @@
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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: Given a list of tuples representing ranges, condense the ranges. \n",
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"\n",
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"Example: [(2, 3), (3, 5), (7, 9), (8, 10)] -> [(2, 5), (7, 10)]\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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"* Are the tuples in sorted order?\n",
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" * No\n",
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"* Are the tuples ints?\n",
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" * Yes\n",
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"* Will all tuples have the first element less than the second?\n",
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" * Yes\n",
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"* Is there an upper bound on the input range?\n",
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" * No\n",
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"* Is the output a list of tuples?\n",
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" * Yes\n",
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"* Is the output a new array?\n",
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" * Yes\n",
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"* Can we assume the inputs are valid?\n",
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" * No, check for None\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 input -> TypeError\n",
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"* [] - []\n",
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"* [(2, 3), (7, 9)] -> [(2, 3), (7, 9)]\n",
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"* [(2, 3), (3, 5), (7, 9), (8, 10)] -> [(2, 5), (7, 10)]\n",
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"* [(2, 3), (3, 5), (7, 9), (8, 10), (1, 11)] -> [(1, 11)]\n",
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"* [(2, 3), (3, 8), (7, 9), (8, 10)] -> [(2, 10)]\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 merge_ranges(self, array):\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_merge_ranges.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 TestMergeRanges(object):\n",
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"\n",
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" def test_merge_ranges(self):\n",
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" solution = Solution()\n",
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" assert_raises(TypeError, solution.merge_ranges, None)\n",
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" assert_equal(solution.merge_ranges([]), [])\n",
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" array = [(2, 3), (7, 9)]\n",
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" expected = [(2, 3), (7, 9)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" array = [(2, 3), (3, 5), (7, 9), (8, 10)]\n",
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" expected = [(2, 5), (7, 10)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" array = [(2, 3), (3, 5), (7, 9), (8, 10), (1, 11)]\n",
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" expected = [(1, 11)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" print('Success: test_merge_ranges')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestMergeRanges()\n",
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" test.test_merge_ranges()\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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256
online_judges/merge_ranges/merge_ranges_solution.ipynb
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256
online_judges/merge_ranges/merge_ranges_solution.ipynb
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@ -0,0 +1,256 @@
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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: Given a list of tuples representing ranges, condense the ranges. \n",
|
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"\n",
|
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"Example: [(2, 3), (3, 5), (7, 9), (8, 10)] -> [(2, 5), (7, 10)]\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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"* Are the tuples in sorted order?\n",
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" * No\n",
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"* Are the tuples ints?\n",
|
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" * Yes\n",
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"* Will all tuples have the first element less than the second?\n",
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" * Yes\n",
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"* Is there an upper bound on the input range?\n",
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" * No\n",
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"* Is the output a list of tuples?\n",
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" * Yes\n",
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"* Is the output a new array?\n",
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" * Yes\n",
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"* Can we assume the inputs are valid?\n",
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" * No, check for None\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 input -> TypeError\n",
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"* [] - []\n",
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"* [(2, 3), (7, 9)] -> [(2, 3), (7, 9)]\n",
|
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"* [(2, 3), (3, 5), (7, 9), (8, 10)] -> [(2, 5), (7, 10)]\n",
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"* [(2, 3), (3, 5), (7, 9), (8, 10), (1, 11)] -> [(1, 11)]\n",
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"* [(2, 3), (3, 8), (7, 9), (8, 10)] -> [(2, 10)]\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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"* Sort the tuples based on start time\n",
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"* Check each adjacent tuple to see if they can be merged\n",
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"\n",
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"<pre>\n",
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"Case: * [(2, 3), (3, 8), (7, 9), (8, 10)] -> [(2, 10)]\n",
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"\n",
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"* Sort by start time (already sorted)\n",
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"* Add the first tuple to the merged_array\n",
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"* Loop through each item in sorted_array starting at index 1\n",
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" * If there is no overlap\n",
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" * Add the current item to merged_array\n",
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" * Else\n",
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" * Update the last item in merged_array\n",
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" * The end time will be the max of merged_array[-1][1] and sorted_array[i][1]\n",
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"\n",
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"Start:\n",
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" i\n",
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" 0 1 2 3\n",
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"sorted_array = [(2, 3), (3, 8), (7, 9), (8, 10)]\n",
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"merged_array = [(2, 3)]\n",
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"\n",
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"Overlap with (2, 3), (3, 8):\n",
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" i\n",
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" 0 1 2 3\n",
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"sorted_array = [(2, 3), (3, 8), (7, 9), (8, 10)]\n",
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"merged_array = [(2, 8)]\n",
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"\n",
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"Overlap with (2, 8), (7, 9):\n",
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" i\n",
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" 0 1 2 3\n",
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"sorted_array = [(2, 3), (3, 8), (7, 9), (8, 10)]\n",
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"merged_array = [(2, 9)]\n",
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"\n",
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"Overlap with (2, 9) (8, 10):\n",
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" i\n",
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" 0 1 2 3\n",
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"sorted_array = [(2, 3), (3, 8), (7, 9), (8, 10)]\n",
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"merged_array = [(2, 10)]\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 log(n))\n",
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"* Space: O(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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"## 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 merge_ranges(self, array):\n",
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" if array is None:\n",
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" raise TypeError('array cannot be None')\n",
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" if not array:\n",
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" return array\n",
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" sorted_array = sorted(array)\n",
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" merged_array = [sorted_array[0]]\n",
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" for index, item in enumerate(sorted_array):\n",
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" if index == 0:\n",
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" continue\n",
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" start_prev, end_prev = merged_array[-1]\n",
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" start_curr, end_curr = item\n",
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" if end_prev < start_curr:\n",
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" # No overlap, add the entry\n",
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" merged_array.append(item)\n",
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" else:\n",
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" # Overlap, update the previous entry's end value\n",
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" merged_array[-1] = (start_prev, max(end_prev, end_curr))\n",
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" return merged_array"
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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_merge_ranges.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_merge_ranges.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 TestMergeRanges(object):\n",
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"\n",
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" def test_merge_ranges(self):\n",
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" solution = Solution()\n",
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" assert_raises(TypeError, solution.merge_ranges, None)\n",
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" assert_equal(solution.merge_ranges([]), [])\n",
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" array = [(2, 3), (7, 9)]\n",
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" expected = [(2, 3), (7, 9)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" array = [(3, 5), (2, 3), (7, 9), (8, 10)]\n",
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" expected = [(2, 5), (7, 10)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" array = [(2, 3), (3, 5), (7, 9), (8, 10), (1, 11)]\n",
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" expected = [(1, 11)]\n",
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" assert_equal(solution.merge_ranges(array), expected)\n",
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" print('Success: test_merge_ranges')\n",
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"\n",
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"\n",
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"def main():\n",
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" test = TestMergeRanges()\n",
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" test.test_merge_ranges()\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_merge_ranges\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_merge_ranges.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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28
online_judges/merge_ranges/test_merge_ranges.py
Normal file
28
online_judges/merge_ranges/test_merge_ranges.py
Normal file
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@ -0,0 +1,28 @@
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from nose.tools import assert_equal, assert_raises
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class TestMergeRanges(object):
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def test_merge_ranges(self):
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solution = Solution()
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assert_raises(TypeError, solution.merge_ranges, None)
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assert_equal(solution.merge_ranges([]), [])
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array = [(2, 3), (7, 9)]
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expected = [(2, 3), (7, 9)]
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assert_equal(solution.merge_ranges(array), expected)
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array = [(3, 5), (2, 3), (7, 9), (8, 10)]
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expected = [(2, 5), (7, 10)]
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assert_equal(solution.merge_ranges(array), expected)
|
||||
array = [(2, 3), (3, 5), (7, 9), (8, 10), (1, 11)]
|
||||
expected = [(1, 11)]
|
||||
assert_equal(solution.merge_ranges(array), expected)
|
||||
print('Success: test_merge_ranges')
|
||||
|
||||
|
||||
def main():
|
||||
test = TestMergeRanges()
|
||||
test.test_merge_ranges()
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Loading…
Reference in New Issue
Block a user