However, both the Binary search tree algorithm and the Hashset.Contains() method seemed to take the same amount of time. Average Running Time The average running time of the binary search tree operations is … Both binary search trees and red-black trees maintain the binary search tree property. Now, the question that arises here is that when should we use BST over Hash Table and where should we prefer Hash Table over BST? O(1) because we don’t create any space to add the node in the given binary tree. Initially I was surprised by the performance of the BST algorithm. Reference Interview Question. Assume there is an partial ordering on the nodes (I can order them all using a [math]<=[/math] relationship). Balanced binary search trees have a fairly uniform complexity: each element takes one node in the tree ... but indexed differently from a search tree: you write the key in binary, and go left for a 0 and right for a 1. Should we always use a Hash Table because the time complexity of insertion, deletion, and searching is O(1) or we should use BST? Time Complexity of a Search in a Binary Tree Suppose we have a key , and we want to retrieve the associated fields of for . ", but "why does knowing that the height of the tree is log2(n) equate to the complexity being O(log(n))?". The problem is formulated as the identification of the node such that . A binary search tree is a data structure where each node has at most two children. Space Complexity. So we have seen the differences between the Binary Search Tree and Hash Table. How come he came up the time coomplexity is log in just by breaking off binary tree and knowing height is log n. I'm guessing this is a key part of the question: you're wondering not just "why is the complexity log(n)? Linear time complexity means it’s in order of N. READ Segment Tree. Here we visit in linear time. Binary Search Tree Performance Page 3 Binary search trees, such as those above, in which the nodes are in order so that all links are to right children (or all are to left children), are called skewed trees.