Binary Search Tree
**********************

The definition of binary search tree (BST) can be slightly different in different context. Sometimes, it requires parent strictly greater than ``any node in left subtree``, and other times the parent node can be equal to the max node in the left subtree.

.. figure:: is_bst.png
  :name: is_bst
  :align: center
  
  A Binary Search Tree

.. toctree::
  :maxdepth: 2

  bst
  map_set
  questions