Left view of a tree, C++ (gcc)

Left view of a tree

//Title of this code

#include <iostream>
#include <list>
using namespace std;

struct BinTree {
    int data;
    BinTree *left;
    BinTree *right;
    
    BinTree(int d, BinTree* l, BinTree* r): data(d), left(l), right(r) {}
    
};

static int max_height;

void left_tree_view(BinTree* cur, int height) {
    
    if (!cur)
        return;
    
    if (height > max_height) {
        cout << cur->data << endl;
        ++max_height;
    }
    
    
    left_tree_view(cur->left, height + 1);
    left_tree_view(cur->right, height + 1);
    
    
    
}

//        1
//      /   \
//     2     3
//    / \   / \
//   4   5 6   7
//        / \
//       8   9

int main()
{
    BinTree *j = new BinTree(9, NULL, NULL);
    BinTree *h = new BinTree(8, NULL, NULL);
    BinTree *g = new BinTree(7, NULL, NULL);
    BinTree *f = new BinTree(6, h, j);
    BinTree *e = new BinTree(5, NULL, NULL);
    BinTree *d = new BinTree(4, NULL, NULL);
    BinTree *c = new BinTree(3, f, g);
    BinTree *b = new BinTree(2, d, e);
    BinTree *a = new BinTree(1, b, c);
    
    max_height = 0;
    left_tree_view(a, 1);

}


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