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Polish graph path exists challenge and solution (#89)

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Update constraints and code.
This commit is contained in:
Donne Martin 2016-06-28 04:38:02 -04:00 committed by GitHub
parent d4ef6108fb
commit 618eeedfe3
2 changed files with 18 additions and 12 deletions
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14
graphs_trees/graph_path_exists/path_exists_challenge.ipynb
View File

@ -37,6 +37,10 @@
"* Is the graph directed?\n", "* Is the graph directed?\n",
" * Yes\n", " * Yes\n",
"* Can we assume we already have Graph and Node classes?\n", "* Can we assume we already have Graph and Node classes?\n",
" * Yes\n",
"* Can we assume the inputs are valid?\n",
" * Yes\n",
"* Can we assume this fits memory?\n",
" * Yes" " * Yes"
] ]
}, },
@ -177,21 +181,21 @@
], ],
"metadata": { "metadata": {
"kernelspec": { "kernelspec": {
"display_name": "Python 2", "display_name": "Python 3",
"language": "python", "language": "python",
"name": "python2" "name": "python3"
}, },
"language_info": { "language_info": {
"codemirror_mode": { "codemirror_mode": {
"name": "ipython", "name": "ipython",
"version": 2 "version": 3
}, },
"file_extension": ".py", "file_extension": ".py",
"mimetype": "text/x-python", "mimetype": "text/x-python",
"name": "python", "name": "python",
"nbconvert_exporter": "python", "nbconvert_exporter": "python",
"pygments_lexer": "ipython2", "pygments_lexer": "ipython3",
"version": "2.7.10" "version": "3.5.0"
} }
}, },
"nbformat": 4, "nbformat": 4,

16
graphs_trees/graph_path_exists/path_exists_solution.ipynb
View File

@ -36,6 +36,10 @@
"* Is the graph directed?\n", "* Is the graph directed?\n",
" * Yes\n", " * Yes\n",
"* Can we assume we already have Graph and Node classes?\n", "* Can we assume we already have Graph and Node classes?\n",
" * Yes\n",
"* Can we assume the inputs are valid?\n",
" * Yes\n",
"* Can we assume this fits memory?\n",
" * Yes" " * Yes"
] ]
}, },
@ -130,8 +134,6 @@
" start.visit_state = State.visited\n", " start.visit_state = State.visited\n",
" while queue:\n", " while queue:\n",
" node = queue.popleft()\n", " node = queue.popleft()\n",
" if node is None:\n",
" continue\n",
" if node is end:\n", " if node is end:\n",
" return True\n", " return True\n",
" for adj_node in node.adjacent:\n", " for adj_node in node.adjacent:\n",
@ -222,21 +224,21 @@
], ],
"metadata": { "metadata": {
"kernelspec": { "kernelspec": {
"display_name": "Python 2", "display_name": "Python 3",
"language": "python", "language": "python",
"name": "python2" "name": "python3"
}, },
"language_info": { "language_info": {
"codemirror_mode": { "codemirror_mode": {
"name": "ipython", "name": "ipython",
"version": 2 "version": 3
}, },
"file_extension": ".py", "file_extension": ".py",
"mimetype": "text/x-python", "mimetype": "text/x-python",
"name": "python", "name": "python",
"nbconvert_exporter": "python", "nbconvert_exporter": "python",
"pygments_lexer": "ipython2", "pygments_lexer": "ipython3",
"version": "2.7.10" "version": "3.5.0"
} }
}, },
"nbformat": 4, "nbformat": 4,