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// Following is the Binary Tree node structure
/**************
class BinaryTreeNode {
    public : 
    T data;
    BinaryTreeNode<T> *left;
    BinaryTreeNode<T> *right;
 
    BinaryTreeNode(T data) {
        this -> data = data;
        left = NULL;
        right = NULL;
    }
};
***************/
void leftBoundary(BinaryTreeNode<int>* root){
    if(root == NULL){
        return;
    }
    if(root->left){
        cout<<root->data<<" ";
       	leftBoundary(root->left);
   	}
    else if(root->right){
      	leftBoundary(root->right);
    	cout<<root->data<<" ";   
    }
 
}
void rightBoundary(BinaryTreeNode<int>* root){
    if(root == NULL){
        return;
    }
    if(root->right){
        rightBoundary(root->right);
        cout<<root->data<<" ";
    }
    else if(root->left){
        rightBoundary(root->left);    
    	cout<<root->data<<" ";
    }
 
}
 
void solve(BinaryTreeNode<int>* root){
    	/* Don't write main().
	* Don't read input, it is passed as function argument.
	*/
	if(root == NULL){
        return;
    }
    if(root->left == NULL || root->right == NULL){
        cout<<root->data<<" ";
    }
    cout<<root->data<<" ";
    leftBoundary(root->left);
    rightBoundary(root->left);
}
 

prog.cpp:16:19: error: variable or field ‘leftBoundary’ declared void
 void leftBoundary(BinaryTreeNode<int>* root){
                   ^~~~~~~~~~~~~~
prog.cpp:16:19: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:16:34: error: expected primary-expression before ‘int’
 void leftBoundary(BinaryTreeNode<int>* root){
                                  ^~~
prog.cpp:30:20: error: variable or field ‘rightBoundary’ declared void
 void rightBoundary(BinaryTreeNode<int>* root){
                    ^~~~~~~~~~~~~~
prog.cpp:30:20: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:30:35: error: expected primary-expression before ‘int’
 void rightBoundary(BinaryTreeNode<int>* root){
                                   ^~~
prog.cpp:45:12: error: variable or field ‘solve’ declared void
 void solve(BinaryTreeNode<int>* root){
            ^~~~~~~~~~~~~~
prog.cpp:45:12: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:45:27: error: expected primary-expression before ‘int’
 void solve(BinaryTreeNode<int>* root){
                           ^~~

Standard output is empty