C++

implement the function:

vector level_traversal(const BinaryNode* root)

Add each node's data to a vecotr and return that vector

Given BinaryNode.h:

typedef T;

struct BinaryNode{

T elem;

BinaryNode* left;

BinaryNode* right;

BinaryNode( T d, BinaryNode* l =NULL, BinaryNode *r = NULL):elem(d) ,left(1), right(r){};

};

need to implement that function in level_traversal.h file

thank u !