#include <stdlib.h>
 
struct node {
    int p;
    struct node* n;
};
 
int main() {
    struct node a = {1, NULL};
    struct node b = {2, NULL};
    struct node c = {3, NULL};
 
    a.n = &b; b.n = &c; c.n = NULL;
    c.n = &a; a.n = &b; b.n = NULL;
    struct node* head = &c;
    printf("%d %d %d", head->p, head->n->p, head->n->n->p);
    return 0;
}


// head -> c -> a -> b -> null
// 3 1 2