Print the number of set bits in each node of a Binary Tree

Given a Binary Tree. The task is to print the number of set bits in each of the nodes in the Binary Tree.

The idea is to traverse the given binary tree using any tree traversal method, and for each node calculate the number of set bits and print it.

Note: One can also use the __builtin_popcount() function available in C++ to directly count the number of set bits in an integer.

Below is the implementation of the above approach:

C++

filter_none

edit
close

play_arrow

link
brightness_4
code

// CPP program to print the number of set bits
// in each node of the binary tree
  
#include <bits/stdc++.h>
  
using namespace std;
  
// Binary Tree node
struct Node {
    int data;
    struct Node *left, *right;
};
  
// Utility function that allocates a new Node
Node* newNode(int data)
{
    Node* node = new Node;
    node->data = data;
    node->left = node->right = NULL;
    return (node);
}
  
// Function to print the number of set bits
// in each node of the binary tree
void printSetBit(Node* root)
{
    if (root == NULL)
        return;
  
    // Print the number of set bits of
    // current node using __builtin_popcount()
    cout << "Set bits in Node " << root->data << " = " <<
                  __builtin_popcount(root->data) << "\n";
  
    // Traverse Left Subtree
    printSetBit(root->left);
  
    // Traverse Right Subtree
    printSetBit(root->right);
}
  
// Driver code
int main()
{
    Node* root = newNode(16);
    root->left = newNode(13);
    root->left->left = newNode(14);
    root->left->right = newNode(12);
    root->right = newNode(11);
    root->right->left = newNode(10);
    root->right->right = newNode(16);
  
    printSetBit(root);
  
    return 0;
}

chevron_right


Java

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to print the number of set bits
// in each node of the binary tree
import java.util.*;
  
class GFG 
{
  
// Binary Tree node
static class Node 
{
    int data;
    Node left, right;
};
  
// Utility function that allocates a new Node
static Node newNode(int data)
{
    Node node = new Node();
    node.data = data;
    node.left = node.right = null;
    return (node);
}
  
// Function to print the number of set bits
// in each node of the binary tree
static void printSetBit(Node root)
{
    if (root == null)
        return;
  
    // Print the number of set bits of
    // current node using __builtin_popcount()
    System.out.print("Set bits in Node " + root.data + " = " +
                      Integer.bitCount(root.data) + "\n");
  
    // Traverse Left Subtree
    printSetBit(root.left);
  
    // Traverse Right Subtree
    printSetBit(root.right);
}
  
// Driver code
public static void main(String[] args) 
{
    Node root = newNode(16);
    root.left = newNode(13);
    root.left.left = newNode(14);
    root.left.right = newNode(12);
    root.right = newNode(11);
    root.right.left = newNode(10);
    root.right.right = newNode(16);
  
    printSetBit(root);
}
}
  
// This code is contributed by PrinciRaj1992 

chevron_right


C#

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to print the number of set bits
// in each node of the binary tree
using System;
      
class GFG 
{
  
// Binary Tree node
public class Node 
{
    public int data;
    public Node left, right;
};
  
// Utility function that allocates a new Node
static Node newNode(int data)
{
    Node node = new Node();
    node.data = data;
    node.left = node.right = null;
    return (node);
}
  
// Function to print the number of set bits
// in each node of the binary tree
static void printSetBit(Node root)
{
    if (root == null)
        return;
  
    // Print the number of set bits of
    // current node using __builtin_popcount()
    Console.Write("Set bits in Node " + root.data + 
                  " = " + bitCount(root.data) + "\n");
  
    // Traverse Left Subtree
    printSetBit(root.left);
  
    // Traverse Right Subtree
    printSetBit(root.right);
}
  
static int bitCount(int x)
{
    int setBits = 0;
    while (x != 0)
    {
        x = x & (x - 1);
        setBits++;
    }
    return setBits;
  
// Driver code
public static void Main(String[] args) 
{
    Node root = newNode(16);
    root.left = newNode(13);
    root.left.left = newNode(14);
    root.left.right = newNode(12);
    root.right = newNode(11);
    root.right.left = newNode(10);
    root.right.right = newNode(16);
  
    printSetBit(root);
}
}
  
// This code is contributed by 29AjayKumar

chevron_right


Output:

Set bits in Node 16 = 1
Set bits in Node 13 = 3
Set bits in Node 14 = 3
Set bits in Node 12 = 2
Set bits in Node 11 = 3
Set bits in Node 10 = 2
Set bits in Node 16 = 1


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.



Improved By : princiraj1992, 29AjayKumar



Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.