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SumOfAllNodesInBinaryTree.java
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SumOfAllNodesInBinaryTree.java
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import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
public class SumOfAllNodesInBinaryTree {
private static List<Integer> nodes = new ArrayList<Integer>();
private static List<Integer> nodesInLevelOrder = new ArrayList<Integer>();
class Node {
int data;
Node left;
Node right;
}
public Node createNewNode(int data) {
Node node = new Node();
node.data = data;
node.left = null;
node.right = null;
return node;
}
public void sumNodesUsingLevelOrder(Node root) {
if (root == null) {
return;
}
Queue<Node> queue = new LinkedList<>();
queue.add(root);
while (!queue.isEmpty()) {
Node temp = queue.poll();
nodesInLevelOrder.add(temp.data);
if (temp.left != null) {
queue.add(temp.left);
}
if (temp.right != null) {
queue.add(temp.right);
}
}
}
public void sumNodeUsingInOrder(Node root) {
if (root == null) {
return;
}
sumNodeUsingInOrder(root.left);
nodes.add(root.data);
sumNodeUsingInOrder(root.right);
}
public static void main(String[] args) {
SumOfAllNodesInBinaryTree opr = new SumOfAllNodesInBinaryTree();
Node root = opr.createNewNode(2);
root.left = opr.createNewNode(7);
root.right = opr.createNewNode(5);
root.left.left = opr.createNewNode(2);
root.left.right = opr.createNewNode(6);
root.left.right.left = opr.createNewNode(5);
root.left.right.right = opr.createNewNode(11);
root.right.right = opr.createNewNode(9);
root.right.right.left = opr.createNewNode(4);
opr.sumNodesUsingLevelOrder(root);
opr.sumNodeUsingInOrder(root);
System.out.println("Nodes sum using level-order : " + nodesInLevelOrder.stream().reduce(0, (a, b) -> a + b));
System.out.println("Nodes sum using in-order : " + nodes.stream().reduce(0, (a, b) -> a + b));
}
}