exam task

task3/task3.c

@@ -24,8 +24,7 @@ void add_node(NODE *list, int val) {
   if (node == NULL) {
     return;
   }
-  for (; list->next != NULL; list = list->next)
-    ;
+  for (; list->next != NULL; list = list->next);
   list->next = node;
 }
 
@@ -67,6 +66,43 @@ NODE *reverse_list(NODE *list) {
   return list;
 }
 
+void delete_list(NODE* list) {
+  if(list -> next == NULL) {
+    free(list);
+    return;
+  }
+  NODE* next_node = list -> next;
+  while (next_node != NULL) {
+    free(list);
+    list = next_node;
+    next_node = list -> next;
+  }
+  free(list);
+  return;
+}
+
+NODE* list_remove_all(NODE *list, int val) {
+  NODE* head = list;
+  NODE* buf;
+  while (head != NULL && head->val == val) {
+    buf = head->next;
+    free(head);
+    head = buf;
+  }
+  if (head == NULL) return head;
+  list = head;
+  while (list->next != NULL) {
+    if (list->next->val == val) {
+      while(list->next != NULL && list->next->val == val) {
+        buf = list->next;
+        list->next = list->next->next;
+        free(buf);
+      }
+    } else list = list->next;
+  }
+  return head;
+}
+
 int main() {
   NODE *list = init_node(4);
   add_node(list, 5);
@@ -79,10 +115,17 @@ int main() {
   add_node(list, 2);
   add_node(list, 3);
   add_node(list, 4);
+  add_node(list, 3);
+  add_node(list, 3);
+  add_node(list, 1);
   print_list(list);
   printf("\n[%d]\n\n", count_length(list));
   list = reverse_list(list);
   print_list(list);
   printf("\n[%d]\n\n", count_length(list));
+  list = list_remove_all(list, 1);
+  print_list(list);
+  printf("\n[%d]\n\n", count_length(list));
+  delete_list(list);
   return 0;
 }