CPP/Count_Sum_of_Nodes.cpp at main · FreeDSA/CPP · GitHub

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#include<bits/stdc++.h>
#include<iostream>

using namespace std;

class Node{
    public:
    int data;
    Node* left;
    Node* right;
    Node(int val){
        data=val;
        left=NULL;
        right=NULL;
    }
};

int countNode(Node* root){
    if(root==NULL){
        return 0;
    }
    return (countNode(root->left)+countNode(root->right)+1);
}

int sumNode(Node* root){
    if(root==NULL){
        return 0;
    }
    return (sumNode(root->left)+sumNode(root->right)+root->data);
}

int main(){
    Node* root=new Node(1);

    root->left=new Node(2);
    root->left->left=new Node(4);
    root->left->right=new Node(5);

    root->right=new Node(3);
    root->right->left=new Node(6);
    root->right->right=new Node(7);
    // root->right->right->right=new Node(8);

    // cout<<countNode(root)<<"\n";

    cout<<sumNode(root)<<"\n";

    return 0;
}