aitai bolse maybe

#include<stdio.h>
#include<stdlib.h>
typedef struct ptr
{
    int x;
    struct ptr *pt;
}ptr;
ptr *head=NULL;
int main()
{
    ptr *a=(ptr*)malloc(sizeof(ptr));
    a->pt=NULL;
    a->x=01;
    head=a;
    ptr *b=(ptr*)malloc(sizeof(ptr));
    b->pt=NULL;
    b->x=02;
    a->pt=b;
    ptr *c=(ptr*)malloc(sizeof(ptr));
    c->pt=NULL;
    c->x=03;
    b->pt=c;
    ptr *d=(ptr*)malloc(sizeof(ptr));
    d->x=05;
    c->pt=d;
    d->pt=head;


    return 0;


}