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Added linked list find method.

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Donne Martin
2015-05-05 17:47:37 -04:00
parent 8c9482c488
commit f652c7db1e
1 changed files with 56 additions and 19 deletions
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75
linked-lists/linked-list.ipynb
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@@ -43,11 +43,14 @@
"\n", "\n",
"### Find\n", "### Find\n",
"\n", "\n",
"* Coming soon\n", "* Find a NULL\n",
"* Find in an empty list\n",
"* Find in a list with one element or more matching elements\n",
"* Find in a list with no matches\n",
"\n", "\n",
"### Delete\n", "### Delete\n",
"\n", "\n",
"* Coming soon\n", "* \n",
"\n", "\n",
"### Print\n", "### Print\n",
"\n", "\n",
@@ -77,7 +80,11 @@
"\n", "\n",
"### Find\n", "### Find\n",
"\n", "\n",
"* Coming soon\n", "* If data we are finding is NULL, return\n",
"* If the list is empty, return\n",
"* For each node\n",
" * If the value is a match, return it\n",
" * Else, move on to the next node\n",
"\n", "\n",
"Complexity:\n", "Complexity:\n",
"* Time: O(n)\n", "* Time: O(n)\n",
@@ -110,7 +117,7 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 19, "execution_count": null,
"metadata": { "metadata": {
"collapsed": false "collapsed": false
}, },
@@ -137,6 +144,18 @@
" else:\n", " else:\n",
" node.next = self.head\n", " node.next = self.head\n",
" self.head = node\n", " self.head = node\n",
" \n",
" def find(self, data):\n",
" if data is None:\n",
" return\n",
" if self.head is None:\n",
" return\n",
" curr_node = self.head\n",
" while curr_node is not None:\n",
" if curr_node.data == data:\n",
" return curr_node\n",
" else:\n",
" curr_node = curr_node.next\n",
"\n", "\n",
" def print_list(self):\n", " def print_list(self):\n",
" curr_node = self.head\n", " curr_node = self.head\n",
@@ -147,23 +166,11 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 30, "execution_count": null,
"metadata": { "metadata": {
"collapsed": false "collapsed": false
}, },
"outputs": [ "outputs": [],
{
"name": "stdout",
"output_type": "stream",
"text": [
"10\n",
"10\n",
"bc\n",
"a\n",
"10\n"
]
}
],
"source": [ "source": [
"# Test insert_to_front\n", "# Test insert_to_front\n",
"# Insert in an empty list\n", "# Insert in an empty list\n",
@@ -181,7 +188,37 @@
}, },
{ {
"cell_type": "code", "cell_type": "code",
"execution_count": 31, "execution_count": null,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"# Test find\n",
"# Find a NULL\n",
"linked_list = LinkedList(None)\n",
"node = linked_list.find('a')\n",
"print(node)\n",
"# Find in an empty list\n",
"head = Node(10)\n",
"linked_list = LinkedList(None)\n",
"node = linked_list.find(None)\n",
"print(node)\n",
"# Find in a list with one element or more matching elements\n",
"head = Node(10)\n",
"linked_list = LinkedList(head)\n",
"linked_list.insert_to_front('a')\n",
"linked_list.insert_to_front('bc')\n",
"node = linked_list.find('a')\n",
"print(node)\n",
"# Find in a list with no matches\n",
"node = linked_list.find('aaa')\n",
"print(node)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": { "metadata": {
"collapsed": false "collapsed": false
}, },