Difference ?

Question

Global root
Node* root = NULL;

Now What is the difference between below 2 snippets for above global root node pointer
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int key = 8;
Node p(key);
root = &p;
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Node* p = new Node(key);
root = p;

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Method 2 is working fine , but 1 is not

https://code.sololearn.com/cli95tT47la9/?ref=app

Answer 1

1 is not working because Node p will no longer exist once you return from BST::Insert

2 instead creates a new Node that will exist until you delete it