Disjoint set data structure in c

Question

I want to implement the structure on the image in C language. But I have a problem because the 2 structures created call each other and therefore pose a problem how can I remedy it?

set data structure picture : Imgur link

liste set :

typedef struct liste_set
{
    set *head;
    set *tail;
} liste_set;

set :

typedef struct set set;
struct set
{
    int value;
    liste_set *liste;
    set *next;
};

Thank you for your help.

Answer 1

All you have to do is have preceeding declerations so the compiler knows what set is even before you actually fully declare it.

// declare structs
struct liste_set;
struct set;

// typedef struct x to just x
typedef struct liste_set liste_set;
typedef struct set set;

// describe what the structs are
struct liste_set
{
    set *head;
    set *tail;
};

struct set
{
    int value;
    liste_set *liste;
    set *next;
};