DS-Programming

Question

Consider the following code

Comments

x is uninitialised..How to go about it..:)

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x is no where used in the code. And the question asks for the sum of the internal nodes after the execution of that function. So i think ans is 22.

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yes, x is not required in calculation . na?

@Habib

Answer 1

It will change the value of all the nodes which are odd.

Means root->left  will become 0 from 1

and root->right will become 6 from 7

4  

0 6

6 4 2

8 2 8

Now sum of internal nodes wil be : 4 + 0 + 6 + 6 + 4 + 2 =  22

Comments

//check the code for the above , run it on ide , 
//and tested it yourself with different test cases.
#include <bits/stdc++.h>
using namespace std;
struct treenode{
 int data;
 treenode *left;
 treenode *right;
};
treenode* create(int data){
   treenode *temp = (treenode*)malloc(sizeof(treenode));
   temp->data = data;
   temp->left = temp->right  = NULL;
   return temp;
}
int solve(treenode *root) { // will return 0 always
  int x;
  if(root == NULL) return 0;
  else
  if(root->data % 2 == 1){ // changing odd data items
      root->data -= 1;
      x++;
  }
  return solve(root->left) + solve(root->right);
}
void inorder(treenode *root) {
  if(root == NULL) return;
    inorder(root->left);
    cout << root->data <<" ";
    inorder(root->right);
}
int main(){
     treenode *root;
     root = create(4);
     root->left = create(1);
     root->right = create(7);
     root->left->left = create(6);
     root->left->right = create(4);
     root->right->left = create(2);
     root->left->left->right = create(8);
     root->left->right->left = create(2);
     root->right->left->left = create(8);
     cout << solve(root) << endl;
     inorder(root);
     cout << endl;
    return 0;
}

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// output
0
6 8 0 2 4 4 8 2 6 

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