sparse: fix comment typo

diff --git a/lib/sparse/BinaryHeap.h b/lib/sparse/BinaryHeap.h
index 2275cc8c84b699c7aacefe22fb2763c8cae40cb8..54cd1e2969905f32731e6ae72fb95b5df7f1c1c2 100644 (file)
--- a/lib/sparse/BinaryHeap.h
+++ b/lib/sparse/BinaryHeap.h
@@ -37,7 +37,7 @@ struct BinaryHeap_struct {
                    pos_to_id[id_to_pos[i]] = i, for i not in the id_stack & i < length(id_stack)+len
                    id_to_pos[pos_to_id[i]] = i, 0 <= i < len
                 */
-  int_stack_t id_stack;/* a stack that store IDs that is no longer used, to
+  int_stack_t id_stack;/* a stack that stores IDs that are no longer used, to
                       be assigned to newly inserted elements.
                       For sanity check, the union of items in
                       the id_stack, and that is pos_to_id[1:len],