typedef struct skiplistnode_struct{
void *data;
struct skiplistnode_struct *forward[1]; /* this must be the last element of the struct,as we allocate # of elements during runtime*/
}skiplistnode;
typedef struct skiplist_struct{
int current_level;
int max_levels;
float level_probability;
unsigned long items;
int allow_duplicates;
int append_duplicates;
int (*compare_function)(void *,void *);
skiplistnode *head;
}skiplist;
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