Sum of all leaf nodes from a N-ary Tree

Given an N-ary tree, Our goal is to find sum of all leaf node which are present in given tree. For example.

Sum of leaf nodes in N-ary tree

Here given code implementation process.

import java.util.Vector;
// Java program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    public int key;
    public Vector < TreeNode > child;
    public TreeNode(int key)
    {
        // Set node key
        this.key = key;
        // Create memory of TreeNode child
        this.child = new Vector < TreeNode > ();
    }
    public void addChild(int key)
    {
        // Create a new node
        TreeNode node = new TreeNode(key);
        // Add node into child
        this.child.add(node);
    }
} 
public class NAryTree
{
    public TreeNode root;
    public NAryTree()
    {
        // Initial root
        this.root = null;
    }
    public int findLeafNodeSum(TreeNode node)
    {
        if (node == null)
        {
            // When node is null
            return 0;
        }
        if (node.child.size() == 0)
        {
            // When node is leaf node
            return node.key;
        }
        // Auxiliary variables
        int i = 0;
        int sum = 0;
        // iterating the child of given node
        while (i < node.child.size())
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += findLeafNodeSum(node.child.get(i));
            // Get next child
            i++;
        }
        // Return calculated sum
        return sum;
    }
    public static void main(String[] args)
    {
        NAryTree tree = new NAryTree();
        /*
                   10
                  /   \
                 /     \
                /       \   
               8         5
              /|\       /|\  
             / | \     / | \ 
            -2 1  6   7  4  3  
              / \      \    
             9  11     -1   
               /  \
              12   -3   
            -----------------------
            Constructing N-Arr tree
        */
        // First element of tree
        tree.root = new TreeNode(10);
        tree.root.addChild(8);
        tree.root.addChild(5);
        // Add child node [-2,1,6] in node (8)
        tree.root.child.get(0).addChild(-2);
        tree.root.child.get(0).addChild(1);
        tree.root.child.get(0).addChild(6);
        // Add child node [9,11] in node (1)
        tree.root.child.get(0).child.get(1).addChild(9);
        tree.root.child.get(0).child.get(1).addChild(11);
        // Add child node [12  -3] in node (11)
        tree.root.child.get(0).child.get(1).child.get(1).addChild(12);
        tree.root.child.get(0).child.get(1).child.get(1).addChild(-3);
        // Add child node [7 4 3 ] in node (5)
        tree.root.child.get(1).addChild(7);
        tree.root.child.get(1).addChild(4);
        tree.root.child.get(1).addChild(3);
        // Add child node [-1] in node (7)
        tree.root.child.get(1).child.get(0).addChild(-1);
        // Test
        // ----
        // Leaf node [ -2 9 12 -3 6 -1 4 3]
        // sum = 28
        int ans = tree.findLeafNodeSum(tree.root);
        // Display calculated result
        System.out.println(" Leaf node sum : " + ans);
    }
}

Output

 Leaf node sum : 28
// Include header file
#include <iostream>

#include <vector>

using namespace std;
// C++ program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    public: int key;
    vector < TreeNode *> child;
    TreeNode(int key)
    {
        // Set node key
        this->key = key;
    }
    void addChild(int key)
    {
        // Create a new node
        TreeNode *node = new TreeNode(key);
        // Add node into child
        this->child.push_back(node);
    }
};
class NAryTree
{
    public: TreeNode *root;
    NAryTree()
    {
        this->root = NULL;
    }
    int findLeafNodeSum(TreeNode *node)
    {
        if (node == NULL)
        {
            // When node is null
            return 0;
        }
        if (node->child.size() == 0)
        {
            // When node is leaf node
            return node->key;
        }
        // Auxiliary variables
        int i = 0;
        int sum = 0;
        // iterating the child of given node
        while (i < node->child.size())
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += this->findLeafNodeSum(node->child.at(i));
            // Get next child
            i++;
        }
        // Return calculated sum
        return sum;
    }
};
int main()
{
    NAryTree *tree = new NAryTree();
    /*
                       10
                      /   \
                     /     \
                    /       \   
                   8         5
                  /|\       /|\  
                 / | \     / | \ 
                -2 1  6   7  4  3  
                  / \      \    
                 9  11     -1   
                   /  \
                  12   -3   
                -----------------------
                Constructing N-Arr tree
            */
    // First element of tree
    tree->root = new TreeNode(10);
    tree->root->addChild(8);
    tree->root->addChild(5);
    // Add child node [-2,1,6] in node (8)
    tree->root->child.at(0)->addChild(-2);
    tree->root->child.at(0)->addChild(1);
    tree->root->child.at(0)->addChild(6);
    // Add child node [9,11] in node (1)
    tree->root->child.at(0)->child.at(1)->addChild(9);
    tree->root->child.at(0)->child.at(1)->addChild(11);
    // Add child node [12  -3] in node (11)
    tree->root->child.at(0)->child.at(1)->child.at(1)->addChild(12);
    tree->root->child.at(0)->child.at(1)->child.at(1)->addChild(-3);
    // Add child node [7 4 3 ] in node (5)
    tree->root->child.at(1)->addChild(7);
    tree->root->child.at(1)->addChild(4);
    tree->root->child.at(1)->addChild(3);
    // Add child node [-1] in node (7)
    tree->root->child.at(1)->child.at(0)->addChild(-1);
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    int ans = tree->findLeafNodeSum(tree->root);
    // Display calculated result
    cout << " Leaf node sum : " << ans << endl;
    return 0;
}

Output

 Leaf node sum : 28
package main
import "fmt"
// Go program for
// Sum of all leaf nodes from a N-ary Tree
type TreeNode struct {
    key int
    child [] *TreeNode
}
func getTreeNode(key int) * TreeNode {
    var me *TreeNode = &TreeNode {}
    // Set node key
    me.key = key
    // Create memory of TreeNode child
    me.child = make([] *TreeNode,0)
    return me
}
func(this *TreeNode) addChild(key int) {
    // Create a new node
    var node * TreeNode = getTreeNode(key)
    // Add node into child
    this.child = append(this.child, node)
}
type NAryTree struct {
    root * TreeNode
}
func getNAryTree() * NAryTree {
    var me *NAryTree = &NAryTree {}
    // Initial root
    me.root = nil
    return me
}
func(this NAryTree) findLeafNodeSum(node * TreeNode) int {
    if node == nil {
        // When node is null
        return 0
    }
    if len(node.child) == 0 {
        // When node is leaf node
        return node.key
    }
    // Auxiliary variables
    var i int = 0
    var sum int = 0
    // iterating the child of given node
    for (i < len(node.child)) {
        // Visit i child and
        // Sum of all leaf nodes
        sum += this.findLeafNodeSum(node.child[i])
        // Get next child
        i++
    }
    // Return calculated sum
    return sum
}
func main() {
    var tree * NAryTree = getNAryTree()
    /*
               10
              /   \
             /     \
            /       \   
           8         5
          /|\       /|\  
         / | \     / | \ 
        -2 1  6   7  4  3  
          / \      \    
         9  11     -1   
           /  \
          12   -3   
        -----------------------
        Constructing N-Arr tree
    */
    // First element of tree
    tree.root = getTreeNode(10)
    tree.root.addChild(8)
    tree.root.addChild(5)
    // Add child node [-2,1,6] in node (8)
    tree.root.child[0].addChild(-2)
    tree.root.child[0].addChild(1)
    tree.root.child[0].addChild(6)
    // Add child node [9,11] in node (1)
    tree.root.child[0].child[1].addChild(9)
    tree.root.child[0].child[1].addChild(11)
    // Add child node [12  -3] in node (11)
    tree.root.child[0].child[1].child[1].addChild(12)
    tree.root.child[0].child[1].child[1].addChild(-3)
    // Add child node [7 4 3 ] in node (5)
    tree.root.child[1].addChild(7)
    tree.root.child[1].addChild(4)
    tree.root.child[1].addChild(3)
    // Add child node [-1] in node (7)
    tree.root.child[1].child[0].addChild(-1)
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    var ans int = tree.findLeafNodeSum(tree.root)
    // Display calculated result
    fmt.Println(" Leaf node sum : ", ans)
}

Output

 Leaf node sum : 28
// Include namespace system
using System;
using System.Collections.Generic;
// Csharp program for
// Sum of all leaf nodes from a N-ary Tree
public class TreeNode
{
    public int key;
    public List < TreeNode > child;
    public TreeNode(int key)
    {
        // Set node key
        this.key = key;
        // Create memory of TreeNode child
        this.child = new List < TreeNode > ();
    }
    public void addChild(int key)
    {
        // Create a new node
        TreeNode node = new TreeNode(key);
        // Add node into child
        this.child.Add(node);
    }
}
public class NAryTree
{
    public TreeNode root;
    public NAryTree()
    {
        // Initial root
        this.root = null;
    }
    public int findLeafNodeSum(TreeNode node)
    {
        if (node == null)
        {
            // When node is null
            return 0;
        }
        if (node.child.Count == 0)
        {
            // When node is leaf node
            return node.key;
        }
        // Auxiliary variables
        int i = 0;
        int sum = 0;
        // iterating the child of given node
        while (i < node.child.Count)
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += this.findLeafNodeSum(node.child[i]);
            // Get next child
            i++;
        }
        // Return calculated sum
        return sum;
    }
    public static void Main(String[] args)
    {
        NAryTree tree = new NAryTree();
        /*
                   10
                  /   \
                 /     \
                /       \   
               8         5
              /|\       /|\  
             / | \     / | \ 
            -2 1  6   7  4  3  
              / \      \    
             9  11     -1   
               /  \
              12   -3   
            -----------------------
            Constructing N-Arr tree
        */
        // First element of tree
        tree.root = new TreeNode(10);
        tree.root.addChild(8);
        tree.root.addChild(5);
        // Add child node [-2,1,6] in node (8)
        tree.root.child[0].addChild(-2);
        tree.root.child[0].addChild(1);
        tree.root.child[0].addChild(6);
        // Add child node [9,11] in node (1)
        tree.root.child[0].child[1].addChild(9);
        tree.root.child[0].child[1].addChild(11);
        // Add child node [12  -3] in node (11)
        tree.root.child[0].child[1].child[1].addChild(12);
        tree.root.child[0].child[1].child[1].addChild(-3);
        // Add child node [7 4 3 ] in node (5)
        tree.root.child[1].addChild(7);
        tree.root.child[1].addChild(4);
        tree.root.child[1].addChild(3);
        // Add child node [-1] in node (7)
        tree.root.child[1].child[0].addChild(-1);
        // Test
        // ----
        // Leaf node [ -2 9 12 -3 6 -1 4 3]
        // sum = 28
        int ans = tree.findLeafNodeSum(tree.root);
        // Display calculated result
        Console.WriteLine(" Leaf node sum : " + ans);
    }
}

Output

 Leaf node sum : 28
<?php
// Php program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    public $key;
    public $child;
    public  function __construct($key)
    {
        // Set node key
        $this->key = $key;
        // Create memory of TreeNode child
        $this->child = array();
    }
    public  function addChild($key)
    {
        // Create a new node
        $node = new TreeNode($key);
        // Add node into child
        $this->child[] = $node;
    }
}
class NAryTree
{
    public $root;
    public  function __construct()
    {
        $this->root = NULL;
    }
    public  function findLeafNodeSum($node)
    {
        if ($node == NULL)
        {
            // When node is null
            return 0;
        }
        if (count($node->child) == 0)
        {
            // When node is leaf node
            return $node->key;
        }
        // Auxiliary variables
        $i = 0;
        $sum = 0;
        // iterating the child of given node
        while ($i < count($node->child))
        {
            // Visit i child and
            // Sum of all leaf nodes
            $sum += $this->findLeafNodeSum($node->child[$i]);
            // Get next child
            $i++;
        }
        // Return calculated sum
        return $sum;
    }
}

function main()
{
    $tree = new NAryTree();
    /*
               10
              /   \
             /     \
            /       \   
           8         5
          /|\       /|\  
         / | \     / | \ 
        -2 1  6   7  4  3  
          / \      \    
         9  11     -1   
           /  \
          12   -3   
        -----------------------
        Constructing N-Arr tree
    */
    // First element of tree
    $tree->root = new TreeNode(10);
    $tree->root->addChild(8);
    $tree->root->addChild(5);
    // Add child node [-2,1,6] in node (8)
    $tree->root->child[0]->addChild(-2);
    $tree->root->child[0]->addChild(1);
    $tree->root->child[0]->addChild(6);
    // Add child node [9,11] in node (1)
    $tree->root->child[0]->child[1]->addChild(9);
    $tree->root->child[0]->child[1]->addChild(11);
    // Add child node [12  -3] in node (11)
    $tree->root->child[0]->child[1]->child[1]->addChild(12);
    $tree->root->child[0]->child[1]->child[1]->addChild(-3);
    // Add child node [7 4 3 ] in node (5)
    $tree->root->child[1]->addChild(7);
    $tree->root->child[1]->addChild(4);
    $tree->root->child[1]->addChild(3);
    // Add child node [-1] in node (7)
    $tree->root->child[1]->child[0]->addChild(-1);
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    $ans = $tree->findLeafNodeSum($tree->root);
    // Display calculated result
    echo(" Leaf node sum : ".$ans.
        "\n");
}
main();

Output

 Leaf node sum : 28
// Node JS program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    constructor(key)
    {
        // Set node key
        this.key = key;
        // Create memory of TreeNode child
        this.child = [];
    }
    addChild(key)
    {
        // Create a new node
        var node = new TreeNode(key);
        // Add node into child
        this.child.push(node);
    }
}
class NAryTree
{
    constructor()
    {
        this.root = null;
    }
    findLeafNodeSum(node)
    {
        if (node == null)
        {
            // When node is null
            return 0;
        }
        if (node.child.length == 0)
        {
            // When node is leaf node
            return node.key;
        }
        // Auxiliary variables
        var i = 0;
        var sum = 0;
        // iterating the child of given node
        while (i < node.child.length)
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += this.findLeafNodeSum(node.child[i]);
            // Get next child
            i++;
        }
        // Return calculated sum
        return sum;
    }
}

function main()
{
    var tree = new NAryTree();
    /*
               10
              /   \
             /     \
            /       \   
           8         5
          /|\       /|\  
         / | \     / | \ 
        -2 1  6   7  4  3  
          / \      \    
         9  11     -1   
           /  \
          12   -3   
        -----------------------
        Constructing N-Arr tree
    */
    // First element of tree
    tree.root = new TreeNode(10);
    tree.root.addChild(8);
    tree.root.addChild(5);
    // Add child node [-2,1,6] in node (8)
    tree.root.child[0].addChild(-2);
    tree.root.child[0].addChild(1);
    tree.root.child[0].addChild(6);
    // Add child node [9,11] in node (1)
    tree.root.child[0].child[1].addChild(9);
    tree.root.child[0].child[1].addChild(11);
    // Add child node [12  -3] in node (11)
    tree.root.child[0].child[1].child[1].addChild(12);
    tree.root.child[0].child[1].child[1].addChild(-3);
    // Add child node [7 4 3 ] in node (5)
    tree.root.child[1].addChild(7);
    tree.root.child[1].addChild(4);
    tree.root.child[1].addChild(3);
    // Add child node [-1] in node (7)
    tree.root.child[1].child[0].addChild(-1);
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    var ans = tree.findLeafNodeSum(tree.root);
    // Display calculated result
    console.log(" Leaf node sum : " + ans);
}
main();

Output

 Leaf node sum : 28
#  Python 3 program for
#  Sum of all leaf nodes from a N-ary Tree
class TreeNode :
    def __init__(self, key) :
        #  Set node key
        self.key = key
        #  Create memory of TreeNode child
        self.child = []
    
    def addChild(self, key) :
        #  Create a new node
        node = TreeNode(key)
        #  Add node into child
        self.child.append(node)
    

class NAryTree :
    def __init__(self) :
        self.root = None
    
    def findLeafNodeSum(self, node) :
        if (node == None) :
            #  When node is null
            return 0
        
        if (len(node.child) == 0) :
            #  When node is leaf node
            return node.key
        
        #  Auxiliary variables
        i = 0
        sum = 0
        #  iterating the child of given node
        while (i < len(node.child)) :
            #  Visit i child and
            #  Sum of all leaf nodes
            sum += self.findLeafNodeSum(node.child[i])
            #  Get next child
            i += 1
        
        #  Return calculated sum
        return sum
    

def main() :
    tree = NAryTree()
    #           10
    #          /   \
    #         /     \
    #        /       \   
    #       8         5
    #      /|\       /|\  
    #     / | \     / | \ 
    #    -2 1  6   7  4  3  
    #      / \      \    
    #     9  11     -1   
    #       /  \
    #      12   -3   
    #    -----------------------
    #    Constructing N-Arr tree
    #  First element of tree
    tree.root = TreeNode(10)
    tree.root.addChild(8)
    tree.root.addChild(5)
    #  Add child node [-2,1,6] in node (8)
    tree.root.child[0].addChild(-2)
    tree.root.child[0].addChild(1)
    tree.root.child[0].addChild(6)
    #  Add child node [9,11] in node (1)
    tree.root.child[0].child[1].addChild(9)
    tree.root.child[0].child[1].addChild(11)
    #  Add child node [12  -3] in node (11)
    tree.root.child[0].child[1].child[1].addChild(12)
    tree.root.child[0].child[1].child[1].addChild(-3)
    #  Add child node [7 4 3 ] in node (5)
    tree.root.child[1].addChild(7)
    tree.root.child[1].addChild(4)
    tree.root.child[1].addChild(3)
    #  Add child node [-1] in node (7)
    tree.root.child[1].child[0].addChild(-1)
    #  Test
    #  ----
    #  Leaf node [ -2 9 12 -3 6 -1 4 3]
    #  sum = 28
    ans = tree.findLeafNodeSum(tree.root)
    #  Display calculated result
    print(" Leaf node sum : ", ans)

if __name__ == "__main__": main()

Output

 Leaf node sum :  28
#  Ruby program for
#  Sum of all leaf nodes from a N-ary Tree
class TreeNode 
    # Define the accessor and reader of class TreeNode
    attr_reader :key, :child
    attr_accessor :key, :child
    def initialize(key) 
        #  Set node key
        self.key = key
        #  Create memory of TreeNode child
        self.child = []
    end

    def addChild(key) 
        #  Create a new node
        node = TreeNode.new(key)
        #  Add node into child
        self.child.push(node)
    end

end

class NAryTree 
    # Define the accessor and reader of class NAryTree
    attr_reader :root
    attr_accessor :root
    def initialize() 
        self.root = nil
    end

    def findLeafNodeSum(node) 
        if (node == nil) 
            #  When node is null
            return 0
        end

        if (node.child.length == 0) 
            #  When node is leaf node
            return node.key
        end

        #  Auxiliary variables
        i = 0
        sum = 0
        #  iterating the child of given node
        while (i < node.child.length) 
            #  Visit i child and
            #  Sum of all leaf nodes
            sum += self.findLeafNodeSum(node.child[i])
            #  Get next child
            i += 1
        end

        #  Return calculated sum
        return sum
    end

end

def main() 
    tree = NAryTree.new()
    #           10
    #          /   \
    #         /     \
    #        /       \   
    #       8         5
    #      /|\       /|\  
    #     / | \     / | \ 
    #    -2 1  6   7  4  3  
    #      / \      \    
    #     9  11     -1   
    #       /  \
    #      12   -3   
    #    -----------------------
    #    Constructing N-Arr tree
    #  First element of tree
    tree.root = TreeNode.new(10)
    tree.root.addChild(8)
    tree.root.addChild(5)
    #  Add child node [-2,1,6] in node (8)
    tree.root.child[0].addChild(-2)
    tree.root.child[0].addChild(1)
    tree.root.child[0].addChild(6)
    #  Add child node [9,11] in node (1)
    tree.root.child[0].child[1].addChild(9)
    tree.root.child[0].child[1].addChild(11)
    #  Add child node [12  -3] in node (11)
    tree.root.child[0].child[1].child[1].addChild(12)
    tree.root.child[0].child[1].child[1].addChild(-3)
    #  Add child node [7 4 3 ] in node (5)
    tree.root.child[1].addChild(7)
    tree.root.child[1].addChild(4)
    tree.root.child[1].addChild(3)
    #  Add child node [-1] in node (7)
    tree.root.child[1].child[0].addChild(-1)
    #  Test
    #  ----
    #  Leaf node [ -2 9 12 -3 6 -1 4 3]
    #  sum = 28
    ans = tree.findLeafNodeSum(tree.root)
    #  Display calculated result
    print(" Leaf node sum : ", ans, "\n")
end

main()

Output

 Leaf node sum : 28
import scala.collection.mutable._;
// Scala program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode(var key: Int,
    var child: ArrayBuffer[TreeNode])
{
    def this(key: Int)
    {
        // Set node key
        // Create memory of TreeNode child
        this(key, new ArrayBuffer[TreeNode]());
    }
    def addChild(key: Int): Unit = {
        // Create a new node
        var node: TreeNode = new TreeNode(key);
        // Add node into child
        this.child += node;
    }
}
class NAryTree(var root: TreeNode)
{
    def this()
    {
        this(null);
    }
    def findLeafNodeSum(node: TreeNode): Int = {
        if (node == null)
        {
            // When node is null
            return 0;
        }
        if (node.child.size == 0)
        {
            // When node is leaf node
            return node.key;
        }
        // Auxiliary variables
        var i: Int = 0;
        var sum: Int = 0;
        // iterating the child of given node
        while (i < node.child.size)
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += findLeafNodeSum(node.child(i));
            // Get next child
            i += 1;
        }
        // Return calculated sum
        return sum;
    }
}
object Main
{
    def main(args: Array[String]): Unit = {
        var tree: NAryTree = new NAryTree();
        /*
                   10
                  /   \
                 /     \
                /       \   
               8         5
              /|\       /|\  
             / | \     / | \ 
            -2 1  6   7  4  3  
              / \      \    
             9  11     -1   
               /  \
              12   -3   
            -----------------------
            Constructing N-Arr tree
        */
        // First element of tree
        tree.root = new TreeNode(10);
        tree.root.addChild(8);
        tree.root.addChild(5);
        // Add child node [-2,1,6] in node (8)
        tree.root.child(0).addChild(-2);
        tree.root.child(0).addChild(1);
        tree.root.child(0).addChild(6);
        // Add child node [9,11] in node (1)
        tree.root.child(0).child(1).addChild(9);
        tree.root.child(0).child(1).addChild(11);
        // Add child node [12  -3] in node (11)
        tree.root.child(0).child(1).child(1).addChild(12);
        tree.root.child(0).child(1).child(1).addChild(-3);
        // Add child node [7 4 3 ] in node (5)
        tree.root.child(1).addChild(7);
        tree.root.child(1).addChild(4);
        tree.root.child(1).addChild(3);
        // Add child node [-1] in node (7)
        tree.root.child(1).child(0).addChild(-1);
        // Test
        // ----
        // Leaf node [ -2 9 12 -3 6 -1 4 3]
        // sum = 28
        var ans: Int = tree.findLeafNodeSum(tree.root);
        // Display calculated result
        println(" Leaf node sum : " + ans);
    }
}

Output

 Leaf node sum : 28
import Foundation;
// Swift 4 program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    var key: Int;
    var child: [TreeNode? ];
    init(_ key: Int)
    {
        // Set node key
        self.key = key;
        // Create memory of TreeNode child
        self.child = [TreeNode? ]();
    }
    func addChild(_ key: Int)
    {
        // Create a new node
        let node: TreeNode = TreeNode(key);
        // Add node into child
        self.child.append(node);
    }
}
class NAryTree
{
    var root: TreeNode? ;
    init()
    {
        self.root = nil;
    }
    func findLeafNodeSum(_ node: TreeNode? ) -> Int
    {
        if (node == nil)
        {
            // When node is null
            return 0;
        }
        if (node!.child.count == 0)
        {
            // When node is leaf node
            return node!.key;
        }
        // Auxiliary variables
        var i: Int = 0;
        var sum: Int = 0;
        // iterating the child of given node
        while (i < node!.child.count)
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += self.findLeafNodeSum(node!.child[i]);
            // Get next child
            i += 1;
        }
        // Return calculated sum
        return sum;
    }
}
func main()
{
    let tree: NAryTree = NAryTree();
    /*
               10
              /   \
             /     \
            /       \   
           8         5
          /|\       /|\  
         / | \     / | \ 
        -2 1  6   7  4  3  
          / \      \    
         9  11     -1   
           /  \
          12   -3   
        -----------------------
        Constructing N-Arr tree
    */
    // First element of tree
    tree.root = TreeNode(10);
    tree.root!.addChild(8);
    tree.root!.addChild(5);
    // Add child node [-2,1,6] in node (8)
    tree.root!.child[0]!.addChild(-2);
    tree.root!.child[0]!.addChild(1);
    tree.root!.child[0]!.addChild(6);
    // Add child node [9,11] in node (1)
    tree.root!.child[0]!.child[1]!.addChild(9);
    tree.root!.child[0]!.child[1]!.addChild(11);
    // Add child node [12  -3] in node (11)
    tree.root!.child[0]!.child[1]!.child[1]!.addChild(12);
    tree.root!.child[0]!.child[1]!.child[1]!.addChild(-3);
    // Add child node [7 4 3 ] in node (5)
    tree.root!.child[1]!.addChild(7);
    tree.root!.child[1]!.addChild(4);
    tree.root!.child[1]!.addChild(3);
    // Add child node [-1] in node (7)
    tree.root!.child[1]!.child[0]!.addChild(-1);
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    let ans: Int = tree.findLeafNodeSum(tree.root);
    // Display calculated result
    print(" Leaf node sum : ", ans);
}
main();

Output

 Leaf node sum :  28
// Kotlin program for
// Sum of all leaf nodes from a N-ary Tree
class TreeNode
{
    var key: Int;
    var child: MutableList < TreeNode >  ;
    constructor(key: Int)
    {
        // Set node key
        this.key = key;
        // Create memory of TreeNode child
        this.child = mutableListOf < TreeNode > ();
    }
    fun addChild(key: Int): Unit
    {
        // Create a new node
        val node: TreeNode = TreeNode(key);
        // Add node into child
        this.child.add(node);
    }
}
class NAryTree
{
    var root: TreeNode ? ;
    constructor()
    {
        this.root = null;
    }
    fun findLeafNodeSum(node: TreeNode ? ): Int
    {
        if (node == null)
        {
            // When node is null
            return 0;
        }
        if (node.child.size == 0)
        {
            // When node is leaf node
            return node.key;
        }
        // Auxiliary variables
        var i: Int = 0;
        var sum: Int = 0;
        // iterating the child of given node
        while (i < node.child.size)
        {
            // Visit i child and
            // Sum of all leaf nodes
            sum += this.findLeafNodeSum(node.child[i]);
            // Get next child
            i += 1;
        }
        // Return calculated sum
        return sum;
    }
}
fun main(args: Array < String > ): Unit
{
    val tree: NAryTree = NAryTree();
    /*
               10
              /   \
             /     \
            /       \   
           8         5
          /|\       /|\  
         / | \     / | \ 
        -2 1  6   7  4  3  
          / \      \    
         9  11     -1   
           /  \
          12   -3   
        -----------------------
        Constructing N-Arr tree
    */
    // First element of tree
    tree.root = TreeNode(10);
    tree.root?.addChild(8);
    tree.root?.addChild(5);
    // Add child node [-2,1,6] in node (8)
    tree.root!!.child[0].addChild(-2);
    tree.root!!.child[0].addChild(1);
    tree.root!!.child[0].addChild(6);
    // Add child node [9,11] in node (1)
    tree.root!!.child[0].child[1].addChild(9);
    tree.root!!.child[0].child[1].addChild(11);
    // Add child node [12  -3] in node (11)
    tree.root!!.child[0].child[1].child[1].addChild(12);
    tree.root!!.child[0].child[1].child[1].addChild(-3);
    // Add child node [7 4 3 ] in node (5)
    tree.root!!.child[1].addChild(7);
    tree.root!!.child[1].addChild(4);
    tree.root!!.child[1].addChild(3);
    // Add child node [-1] in node (7)
    tree.root!!.child[1].child[0].addChild(-1);
    // Test
    // ----
    // Leaf node [ -2 9 12 -3 6 -1 4 3]
    // sum = 28
    val ans: Int = tree.findLeafNodeSum(tree.root);
    // Display calculated result
    println(" Leaf node sum : " + ans);
}

Output

 Leaf node sum : 28


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