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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;
 }
 };
 ***************/
 
 
#include <vector>
void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
    int ans;
    if(root == NULL){
        return ;
    }
    if(root->data == k){
       return ;
    }
    if(root->left->data == k || root->right->data ==k){
        ans = root->data;
    }
    v.push_back(ans);
    ancestor(root->left,k,v);
    ancestor(root->right,k,v);
 
}
vector<int> ancestors(BinaryTreeNode<int> *root, int k) {
    /* Don't write main().
     * Don't read input, they are passed as function arguments.
     * Return output and don't print it.
     * Taking input and printing output is handled automatically.
     */
    vector<int>v;
//     if(root == NULL){
//         return ;
//     }
 
    ancestor(root,k,v);
    return v;
}

prog.cpp:19:15: error: variable or field ‘ancestor’ declared void
 void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
               ^~~~~~~~~~~~~~
prog.cpp:19:15: error: ‘BinaryTreeNode’ was not declared in this scope
prog.cpp:19:30: error: expected primary-expression before ‘int’
 void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
                              ^~~
prog.cpp:19:42: error: expected primary-expression before ‘int’
 void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
                                          ^~~
prog.cpp:19:48: error: ‘vector’ was not declared in this scope
 void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
                                                ^~~~~~
prog.cpp:19:48: note: suggested alternative:
In file included from /usr/include/c++/8/vector:64,
                 from prog.cpp:18:
/usr/include/c++/8/bits/stl_vector.h:339:11: note:   ‘std::vector’
     class vector : protected _Vector_base<_Tp, _Alloc>
           ^~~~~~
prog.cpp:19:55: error: expected primary-expression before ‘int’
 void ancestor(BinaryTreeNode<int> *root, int k,vector<int>&v){
                                                       ^~~
prog.cpp:35:1: error: ‘vector’ does not name a type
 vector<int> ancestors(BinaryTreeNode<int> *root, int k) {
 ^~~~~~

Standard output is empty