Print all odd nodes of Binary Search Tree
Given a binary search tree. The task is to print all odd nodes of the binary search tree.
Examples:
Input :
5
/ \
3 7
/ \ / \
2 4 6 8
Output : 3 5 7
Input :
14
/ \
12 17
/ \ / \
8 13 16 19
Output : 13 17 19
Approach: Traverse the Binary Search tree using any of the tree traversals and check if current node’s value is odd. If yes then print it otherwise skip that node.
Below is the implementation of the above Approach:
C++
// C++ program to print all odd node of BST #include <bits/stdc++.h> using namespace std; // create Tree struct Node { int key; struct Node *left, *right; }; // A utility function to create a new BST node Node* newNode(int item) { Node* temp = new Node; temp->key = item; temp->left = temp->right = NULL; return temp; } // A utility function to do inorder traversal of BST void inorder(Node* root) { if (root != NULL) { inorder(root->left); printf("%d ", root->key); inorder(root->right); } } /* A utility function to insert a new node with given key in BST */Node* insert(Node* node, int key) { /* If the tree is empty, return a new node */ if (node == NULL) return newNode(key); /* Otherwise, recur down the tree */ if (key < node->key) node->left = insert(node->left, key); else node->right = insert(node->right, key); /* return the (unchanged) node pointer */ return node; } // Function to print all odd nodes void oddNode(Node* root) { if (root != NULL) { oddNode(root->left); // if node is odd then print it if (root->key % 2 != 0) printf("%d ", root->key); oddNode(root->right); } } // Driver Code int main() { /* Let us create following BST 5 / \ 3 7 / \ / \ 2 4 6 8 */ Node* root = NULL; root = insert(root, 5); root = insert(root, 3); root = insert(root, 2); root = insert(root, 4); root = insert(root, 7); root = insert(root, 6); root = insert(root, 8); oddNode(root); return 0; } |
Java
// Java program to print all odd node of BST class GfG { // create Tree static class Node { int key; Node left, right; } // A utility function to create a new BST node static Node newNode(int item) { Node temp = new Node(); temp.key = item; temp.left = null; temp.right = null; return temp; } // A utility function to do inorder traversal of BST static void inorder(Node root) { if (root != null) { inorder(root.left); System.out.print(root.key + " "); inorder(root.right); } } /* A utility function to insert a new node with given key in BST */static Node insert(Node node, int key) { /* If the tree is empty, return a new node */ if (node == null) return newNode(key); /* Otherwise, recur down the tree */ if (key < node.key) node.left = insert(node.left, key); else node.right = insert(node.right, key); /* return the (unchanged) node pointer */ return node; } // Function to print all odd nodes static void oddNode(Node root) { if (root != null) { oddNode(root.left); // if node is odd then print it if (root.key % 2 != 0) System.out.print(root.key + " "); oddNode(root.right); } } // Driver Code public static void main(String[] args) { /* Let us create following BST 5 / \ 3 7 / \ / \ 2 4 6 8 */ Node root = null; root = insert(root, 5); root = insert(root, 3); root = insert(root, 2); root = insert(root, 4); root = insert(root, 7); root = insert(root, 6); root = insert(root, 8); oddNode(root); } } |
Python3
# Python3 program to print all odd # node of BST # create Tree # to create a new BST node class newNode: # Construct to create a new node def __init__(self, key): self.key = key self.left = None self.right = None # A utility function to do inorder # traversal of BST def inorder( root) : if (root != None): inorder(root.left) print(root.key, end = " ") inorder(root.right) """ A utility function to insert a new node with given key in BST """def insert(node, key): """ If the tree is empty, return a new node """ if (node == None): return newNode(key) """ Otherwise, recur down the tree """ if (key < node.key): node.left = insert(node.left, key) else: node.right = insert(node.right, key) """ return the (unchanged) node pointer """ return node # Function to print all even nodes def oddNode(root) : if (root != None): oddNode(root.left) # if node is even then print it if (root.key % 2 != 0): print(root.key, end = " ") oddNode(root.right) # Driver Code if __name__ == '__main__': """ Let us create following BST 5 / \ 3 7 / \ / \ 2 4 6 8 """ root = None root = insert(root, 5) root = insert(root, 3) root = insert(root, 2) root = insert(root, 4) root = insert(root, 7) root = insert(root, 6) root = insert(root, 8) oddNode(root) # This code is contributed by # Shubham Singh(SHUBHAMSINGH10) |
C#
// C# program to print all odd node of BST using System; public class GfG { // create Tree class Node { public int key; public Node left, right; } // A utility function to create a new BST node static Node newNode(int item) { Node temp = new Node(); temp.key = item; temp.left = null; temp.right = null; return temp; } // A utility function to do // inorder traversal of BST static void inorder(Node root) { if (root != null) { inorder(root.left); Console.Write(root.key + " "); inorder(root.right); } } /* A utility function to insert a new node with given key in BST */static Node insert(Node node, int key) { /* If the tree is empty, return a new node */ if (node == null) return newNode(key); /* Otherwise, recur down the tree */ if (key < node.key) node.left = insert(node.left, key); else node.right = insert(node.right, key); /* return the (unchanged) node pointer */ return node; } // Function to print all odd nodes static void oddNode(Node root) { if (root != null) { oddNode(root.left); // if node is odd then print it if (root.key % 2 != 0) Console.Write(root.key + " "); oddNode(root.right); } } // Driver Code public static void Main(String[] args) { /* Let us create following BST 5 / \ 3 7 / \ / \ 2 4 6 8 */ Node root = null; root = insert(root, 5); root = insert(root, 3); root = insert(root, 2); root = insert(root, 4); root = insert(root, 7); root = insert(root, 6); root = insert(root, 8); oddNode(root); } } // This code has been contributed // by PrinciRaj1992 |
Output:
3 5 7
Time Complexity : O(n) where n is no. Of nodes
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