initializing a vector of structs in class constructor

How would I initialize certain fields in a struct in a class constructor?
I want to create a 11x11 vector.

Say I have the struct:

Code:

struct tree_node
{
    int x, y;
    int visited;
    int UCT_value;
    double percentage;
    tree_node *parent;
}

Here is where it is declared as a 2d array:

Code:

vector<vector<tree_node*> > board_values

Here is what I attempted to do to initialize two things:

Code:

board_values(10, vector<tree_node*>(11, tree_node->x  // and tree_node->y

and I got stuck on how to initialize it. Would I have to manually malloc/new, set the fields to zero manually for each, then push it on the vector 121 times?

Couldn't you do something like this:

Code:

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

struct tree_node {
    int x, y;
    int visited;
    int UCT_value;
    double percentage;
    tree_node *parent;

    tree_node()
    : x(0), y(0), visited(0), UCT_value(0), percentage(0.0), parent(0) { }
};

int main() {
    vector<vector<tree_node*> > board_values(11);
    for (int rows = 0; rows < 11; rows++)
        for (int cols = 0; cols < 11; cols++)
            board_values[rows].push_back(new tree_node);
}

Why don't you suggest an approach instead of posting an answer?