GitHub/interactive-coding-challenges
1
0
Fork 0
mirror of https://github.com/donnemartin/interactive-coding-challenges synced 2026-01-10 03:18:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

Simpilfied depth first search challenge.

Browse Source
This commit is contained in:
Donne Martin
2015-08-01 17:48:52 -04:00
parent 332230c3a1
commit 13d08b80fd
3 changed files with 95 additions and 113 deletions
Download Patch File Download Diff File Expand all files Collapse all files

101
graphs_trees/tree_dfs/dfs_solution.ipynb
View File

@@ -117,50 +117,39 @@
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"%run ../bst/bst.py"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"class Node(object):\n",
"def in_order_traversal(node, visit_func):\n",
" if node is not None:\n",
" in_order_traversal(node.left, visit_func)\n",
" visit_func(node.data)\n",
" in_order_traversal(node.right, visit_func)\n",
"\n",
" def __init__(self, data):\n",
" self.data = data\n",
" self.left = None\n",
" self.right = None\n",
"def pre_order_traversal(node, visit_func):\n",
" if node is not None:\n",
" visit_func(node.data)\n",
" pre_order_traversal(node.left, visit_func)\n",
" pre_order_traversal(node.right, visit_func)\n",
"\n",
" def insert(self, data):\n",
" if data <= self.data:\n",
" if self.left is None:\n",
" self.left = type(self)(data)\n",
" else:\n",
" self.left.insert(data)\n",
" else:\n",
" if self.right is None:\n",
" self.right = type(self)(data)\n",
" else:\n",
" self.right.insert(data)\n",
"\n",
" def in_order_traversal(self, visit_func):\n",
" if self.left is not None:\n",
" self.left.in_order_traversal(visit_func)\n",
" visit_func(self.data)\n",
" if self.right is not None:\n",
" self.right.in_order_traversal(visit_func)\n",
"\n",
" def pre_order_traversal(self, visit_func):\n",
" visit_func(self.data)\n",
" if self.left is not None:\n",
" self.left.pre_order_traversal(visit_func)\n",
" if self.right is not None:\n",
" self.right.pre_order_traversal(visit_func)\n",
"\n",
" def post_order_traversal(self, visit_func):\n",
" if self.left is not None:\n",
" self.left.post_order_traversal(visit_func)\n",
" if self.right is not None:\n",
" self.right.post_order_traversal(visit_func)\n",
" visit_func(self.data)"
"def post_order_traversal(node, visit_func):\n",
" if node is not None:\n",
" post_order_traversal(node.left, visit_func)\n",
" post_order_traversal(node.right, visit_func)\n",
" visit_func(node.data)"
]
},
{
@@ -172,7 +161,7 @@
},
{
"cell_type": "code",
"execution_count": 2,
"execution_count": 3,
"metadata": {
"collapsed": false
},
@@ -183,7 +172,7 @@
},
{
"cell_type": "code",
"execution_count": 3,
"execution_count": 4,
"metadata": {
"collapsed": false
},
@@ -205,40 +194,40 @@
"class TestDfs(object):\n",
"\n",
" def test_dfs(self):\n",
" root = Node(5)\n",
" root.insert(2)\n",
" root.insert(8)\n",
" root.insert(1)\n",
" root.insert(3)\n",
" node = Node(5)\n",
" insert(node, 2)\n",
" insert(node, 8)\n",
" insert(node, 1)\n",
" insert(node, 3)\n",
"\n",
" with captured_output() as (out, err):\n",
" root.in_order_traversal(sys.stdout.write)\n",
" in_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '12358')\n",
"\n",
" with captured_output() as (out, err):\n",
" root.pre_order_traversal(sys.stdout.write)\n",
" pre_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '52138')\n",
"\n",
" with captured_output() as (out, err):\n",
" root.post_order_traversal(sys.stdout.write)\n",
" post_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '13285')\n",
"\n",
" root = Node(1)\n",
" root.insert(2)\n",
" root.insert(3)\n",
" root.insert(4)\n",
" root.insert(5)\n",
" node = Node(1)\n",
" insert(node, 2)\n",
" insert(node, 3)\n",
" insert(node, 4)\n",
" insert(node, 5)\n",
"\n",
" with captured_output() as (out, err):\n",
" root.in_order_traversal(sys.stdout.write)\n",
" in_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '12345')\n",
"\n",
" with captured_output() as (out, err):\n",
" root.pre_order_traversal(sys.stdout.write)\n",
" pre_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '12345')\n",
"\n",
" with captured_output() as (out, err):\n",
" root.post_order_traversal(sys.stdout.write)\n",
" post_order_traversal(node, sys.stdout.write)\n",
" assert_equal(out.getvalue().strip(), '54321')\n",
"\n",
" print('Success: test_dfs')\n",
@@ -255,7 +244,7 @@
},
{
"cell_type": "code",
"execution_count": 4,
"execution_count": 5,
"metadata": {
"collapsed": false
},