interactive-coding-challenges/graphs_trees/tree_bfs/bfs_challenge.ipynb
2016-08-14 08:26:57 -04:00

185 lines
4.1 KiB
Python

{
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"cell_type": "markdown",
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"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: Implement breadth-first traversal on a binary tree.\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 we already have a Node class with an insert method?\n",
" * Yes\n",
"* Can we assume this fits in memory?\n",
" * Yes\n",
"* What should we do with each node when we process it?\n",
" * Call an input method `visit_func` on the node"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Test Cases\n",
"\n",
"### Breadth-First Traversal\n",
"* 5, 2, 8, 1, 3 -> 5, 2, 8, 1, 3"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Algorithm\n",
"\n",
"Refer to the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/graphs_trees/tree_bfs/bfs_solution.ipynb). 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": true
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"outputs": [],
"source": [
"%run ../bst/bst.py\n",
"%load ../bst/bst.py"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false
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"outputs": [],
"source": [
"class BstBfs(Bst):\n",
"\n",
" def bfs(self, visit_func):\n",
" # TODO: Implement me\n",
" pass"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Unit Test"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"%run ../utils/results.py"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"# %load test_bfs.py\n",
"from nose.tools import assert_equal\n",
"\n",
"\n",
"class TestBfs(object):\n",
"\n",
" def __init__(self):\n",
" self.results = Results()\n",
"\n",
" def test_bfs(self):\n",
" bst = BstBfs(Node(5))\n",
" bst.insert(2)\n",
" bst.insert(8)\n",
" bst.insert(1)\n",
" bst.insert(3)\n",
" bst.bfs(self.results.add_result)\n",
" assert_equal(str(self.results), '[5, 2, 8, 1, 3]')\n",
"\n",
" print('Success: test_bfs')\n",
"\n",
"\n",
"def main():\n",
" test = TestBfs()\n",
" test.test_bfs()\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/graphs_trees/tree_bfs/bfs_solution.ipynb) for a discussion on algorithms and code solutions."
]
}
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