A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to Contains(n2, 3) should return true since a tree with root at n2 contains number 3.

C# 7.0, .NET Framework 4.7
 

  •   Example case: System.NotImplementedException at BinarySearchTree.Contains(Node root, Int32 value) in BinarySearchTree.cs:line 23
  •   Correctness: System.NotImplementedException at BinarySearchTree.Contains(Node root, Int32 value) in BinarySearchTree.cs:line 23
  •   Performance test on a large tree: System.NotImplementedException at BinarySearchTree.Contains(Node root, Int32 value) in BinarySearchTree.cs:line 23

Tags
C# Algorithmic thinking Data structures Public
Easy

15min

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