1. ## List Problem

Ok, so I'm trying to tackle an algorithm from a book and need to create a simple list of structures. This is my code, it's pretty self-explanitory. Some empty functions that need to be filled in, a function to initialize the list, initialize nodes and add a node to a list.

Code:
```#include <iostream>

#define max_x 50
#define max_y 50
#define mincost 1
#define max_list 50

using namespace std;

/*GLOBAL VARIABLES*/

int world[max_x][max_y];
int goalx;
int goaly;

/*CLASSES*/

class node
{
public:
int x;
int y;
double f;
double g;
double h;
};

class list
{
public:
int num_elems;
node *elems[max_list];
};

/*LIST FUNCTIONS*/

void list_init(list *ilist)
{
ilist = new list;
ilist->num_elems = 0;
for(int i = 0; i<max_list; i++)
{
ilist->elems[i] = (node *)NULL;
}
}

{
for(int i= 0; i<max_list; i++)
{
{
break;
}
}
}

void list_remove()
{
}

node *list_get()
{
}

node *list_best()
{
}

int list_empty()
{
}

/*OTHER SUPPORT FUNCTIONS*/

void init_node(node *nnode, int x, int y)
{
nnode = new node;
nnode->x = x;
nnode->y = y;
}

/*FORMULAS*/

int calc_g()
{
}

int calc_h()
{
}

int cacl_f()
{
}

/*MAIN PROGRAM*/

int main()
{
int a;
list *new_list;
node *node1;
node *node2;
node *node3;
init_node(node1 ,2 ,3);
init_node(node2 ,2 ,4);
init_node(node3 ,5 ,7);
list_init(new_list);
a = new_list->num_elems;
cout << a << "\n";