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Move bst validate to a class (#98)

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This commit is contained in:
Donne Martin
2016-08-30 06:06:58 -04:00
committed by GitHub
parent 982580d051
commit dfeb7f4d80
3 changed files with 59 additions and 55 deletions
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58
graphs_trees/bst_validate/bst_validate_solution.ipynb
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@@ -113,24 +113,26 @@
},
"outputs": [],
"source": [
"def validate_bst(node):\n",
" if node is None:\n",
" raise Exception('No root node')\n",
" return _validate_bst(node, None, None)\n",
"import sys\n",
"\n",
"\n",
"def _validate_bst(node, mininum, maximum):\n",
" if node is None:\n",
" return True\n",
" if mininum is not None and node.data <= mininum:\n",
" return False\n",
" if maximum is not None and node.data > maximum:\n",
" return False\n",
" if not _validate_bst(node.left, mininum, node.data):\n",
" return False\n",
" if not _validate_bst(node.right, node.data, maximum):\n",
" return False\n",
" return True"
"class BstValidate(Bst):\n",
"\n",
" def validate(self):\n",
" if self.root is None:\n",
" raise Exception('No root node')\n",
" return self._validate(self.root)\n",
"\n",
" def _validate(self, node, mininum=-sys.maxsize, maximum=sys.maxsize):\n",
" if node is None:\n",
" return True\n",
" if node.data <= mininum or node.data > maximum:\n",
" return False\n",
" if not self._validate(node.left, mininum, node.data):\n",
" return False\n",
" if not self._validate(node.right, node.data, maximum):\n",
" return False\n",
" return True"
]
},
{
@@ -168,22 +170,22 @@
" validate_bst(None)\n",
"\n",
" def test_bst_validate(self):\n",
" node = Node(5)\n",
" insert(node, 8)\n",
" insert(node, 5)\n",
" insert(node, 6)\n",
" insert(node, 4)\n",
" insert(node, 7)\n",
" assert_equal(validate_bst(node), True)\n",
" bst = BstValidate(Node(5))\n",
" bst.insert(8)\n",
" bst.insert(5)\n",
" bst.insert(6)\n",
" bst.insert(4)\n",
" bst.insert(7)\n",
" assert_equal(bst.validate(), True)\n",
"\n",
" root = Node(5)\n",
" bst = BstValidate(Node(5))\n",
" left = Node(5)\n",
" right = Node(8)\n",
" invalid = Node(20)\n",
" root.left = left\n",
" root.right = right\n",
" root.left.right = invalid\n",
" assert_equal(validate_bst(root), False)\n",
" bst.root.left = left\n",
" bst.root.right = right\n",
" bst.root.left.right = invalid\n",
" assert_equal(bst.validate(), False)\n",
"\n",
" print('Success: test_bst_validate')\n",
"\n",