1 files changed, 4 insertions, 0 deletions
diff --git a/sets.h b/sets.h
index 9465043..ffdf82d 100644
--- a/sets.h
+++ b/sets.h
@@ -25,6 +25,7 @@ struct set_elt {
     struct set_elt *next;
 };
 typedef struct {
+	int N;		// range for elements (0 to N-1)
     struct set_elt *first, *last;
 	int size;	// number of elements
 } t_set_descriptor;
@@ -39,10 +40,13 @@ typedef void* set;
 
 
 set empty_set(int size);
+set full_set(int size);		// set containing all elements from 0 to n-1
 set singleton(int size, int x);
 set copy_set(const set s);
 void delete_set(set a);
 
+int set_size(const set s);
+
 void set_union_ip(set a, const set b); 
 void set_inter_ip(set a, const set b);
 void set_diff_ip(set a, const set b);