Doubt in the question

#1

I am not able to understand the input format. Can you please explain me.

#2

you have to take input in preorder format
first true means left subtree exist
second true means right subtree exits
false means doesn’t exists

node* buildTreePreOrder(){
	int d;cin>>d;
	node*n=new node(d);
	string s;cin>>s;
	if(s=="true"){
		n->left=buildTreePreOrder();
	}
	cin>>s;
	if(s=="true"){
		n->right=buildTreePreOrder();
	}
	return n;
}
#3

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