1 files changed, 53 insertions, 3 deletions

diff --git a/main.c b/main.c
index cf21b4d..9327660 100644
--- a/main.c
+++ b/main.c
@@ -99,14 +99,64 @@ void remove_element(element* el) {
     } else {
         el->set->head = el->next;
     }
-    //demote(el->set);
+    demote(el->set);
     free(el);
 }
 
 void remove_parents(int id, parent** parents) {
-    for(parent* p=parents[id]; p != NULL; p = p->next) {
+    parent* temp;
+    parent* p = parents[id];
+    while (p != NULL) {
         remove_element(p->pos);
-        free(p);
+        temp = p;
+        p = p->next;
+        free(temp);
+    }
+}
+
+void remove_bucket(bucket* b) {
+    if (b->prev) {
+        b->prev->next = b->next;
+    }
+    if (b->next) {
+        b->next->prev = b->prev;
+    }
+    free(b);
+}
+
+void demote(set* s) {
+    detach_set(s);
+    int size = s->bucket->size;
+    bucket* attach_point;
+    if (s->bucket->prev) {
+        attach_point = s->bucket->prev;    
+    } else if (s->bucket->head) {
+        attach_point = s->bucket;
+    } else {
+
+    }
+        remove_bucket(s->bucket);
+    attach_set(s, size, b);
+}
+
+void detach_set(set* s) {
+    if (s->next) {
+        s->next->prev = s->prev;
+    }
+    if (s->prev) {
+        s->prev->next = s->next;
+    } else {
+        s->bucket->head = s->next;
+    }
+}
+
+void attach_set(set* s, int size, bucket* b) {
+    if (b->size == size) {
+        insert_set(s, b);
+    } else {
+        bucket* nb =  new_bucket(s, size);
+        nb->prev = b;
+        nb->next = b->next;
     }
 }