How to manage an array of pointers to a struct

[JORGEMAL]

Firstly, I have to tell you that I am a beginner in the subject of pointers.
I have the following struct:

struct Item
{
    Item* nextPtr;
    int intKey;
    int intValueLength;
};

Based of such a struct I need to maintain several linked lists, which means I need to keep track of one head pointer for each one. I have thought about using an array (HEADS) which will contain a head pointer for each list. The number of lists is variable and will be calculated at run time so I am defining the array dynamically as follows:

int t = 10;
Item* HEADS = new Item[t];

Firstly, I need to initialize each head pointer to NULL because the linked lists are empty when the program runs. How do I do this initialization?

for (int i = 0; i  <= t - 1; i++)
    // Initialize each element of HEADS to NULL. 

And, of course, I will also need to update each element of HEADS with the proper pointer to a linked list (when inserting and deleting items) and also to get the value of each head pointer to display the elements of each list.

Thank you in advance.
Jorge Maldonado

[keskiverto]

std::vector<Item*> HEADS; // empty list

// When you have a new list:
Item * head = ...
// Add it to HEADS:
HEADS.push_back( head );

See http://www.cplusplus.com/reference/vector/vector/