BST Iterator Problem Statement
You are tasked with creating a class named BSTIterator
that acts as an iterator for the inorder traversal of a binary search tree. Implement the following functions:
BSTIterator(Node root)
: A constructor that inputs the root of the binary search tree and initializes the iterator.next()
: Returns the next smallest element from the inorder traversal of the tree.hasNext()
: Returnstrue
if there remains a next element in the inorder traversal; otherwise, returnsfalse
.
Assume the binary search tree contains 'N' nodes, and you must print its inorder traversal using the iterator.
Input:
The first line of the input includes an integer T
representing the number of test cases.
Each test case consists of a single line with nodes in level order form, where -1 indicates a null node.
For example, the input corresponds to a tree:
4
2 6
1 3 5 7
-1 -1 -1 -1 -1 -1
Output:
Output for each test case should be a line containing the inorder traversal of the binary search tree.
Example:
Input:
4 2 6 1 3 5 7 -1 -1 -1 -1 -1 -1
Output:
1 2 3 4 5 6 7
Explanation:
Level 1:
The root node of the tree is 4
Level 2:
Left child of 4 = 2
Right child of 4 = 6
Level 3:
Left child of 2 = 1
Right child of 2 = 3
Left child of 6 = 5
Right child of 6 = 7
Level 4:
Each child node at this level is null (-1), and the input concludes with all null nodes.
The tree is traversed in inorder, hence the output is 1 2 3 4 5 6 7.
Constraints:
- 1 <= T <= 10
- 1 <= N <= 104
- 1 <= A[i] <= 109
Note:
The input sequence is provided in a single line separated by spaces. Implementation of the given functions is sufficient as output is handled externally.
AnswerBot
1d
Implement a BSTIterator class for inorder traversal of a binary search tree.
Create a BSTIterator class with constructor, next, and hasNext functions.
Use a stack to simulate inorder traversal of the bi...read more
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