class BSTUtils:
minval = float('inf')
prevval = float('-inf')
def minDistanceBST(self, root):
if root == None:
return None
self.minDistanceBST(root.left)
self.minval = min(self.minval, abs(root.data - self.prevval))
self.prevval = root.data
self.minDistanceBST(root.right)
return self.minval
tree = BinaryTreeNode(17)
tree.left = BinaryTreeNode(10)
tree.right = BinaryTreeNode(25)
tree.left.left = BinaryTreeNode(7)
tree.left.right = BinaryTreeNode(12)
tree.right.left = BinaryTreeNode(19)
tree.right.right = BinaryTreeNode(32)
# BinaryTreeUtils().inorder_traversal(tree)
print(BSTUtils().minDistanceBST(tree))
return True
if tree.left and tree.left.data > tree.data:
return False
if tree.right and tree.right.data <= tree.data:
return False
if not validateBST(tree.left) or not validateBST(tree.right):
return False
return True
tree = BinaryTreeNode(1)
tree.left = BinaryTreeNode(2)
tree.right = BinaryTreeNode(3)
tree.left.left = BinaryTreeNode(4)
tree.left.right = BinaryTreeNode(5)
tree.right.left = BinaryTreeNode(6)
tree.right.right = BinaryTreeNode(7)
print(validateBST(tree))
tree = BinaryTreeNode(4)
tree.left = BinaryTreeNode(2)
tree.right = BinaryTreeNode(6)
tree.left.left = BinaryTreeNode(1)
tree.left.right = BinaryTreeNode(3)
tree.right.left = BinaryTreeNode(5)
tree.right.right = BinaryTreeNode(7)