diff --git a/cv4/list_ops.c b/cv4/list_ops.c
index cffcc27..aa12711 100644
--- a/cv4/list_ops.c
+++ b/cv4/list_ops.c
@@ -38,11 +38,6 @@ list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
         return NULL;
     }
 
-    list_t *filteredList = (list_t *)malloc(sizeof(list_t));
-    if (filteredList == NULL) {
-        return NULL;
-    }
-
     size_t count = 0;
     for (size_t i = 0; i < list->length; ++i) {
         if (filter(list->elements[i])) {
@@ -50,16 +45,14 @@ list_t *filter_list(list_t *list, bool (*filter)(list_element_t)) {
         }
     }
 
-    filteredList->length = count;
-
-    filteredList->elements = (list_element_t *)malloc(count * sizeof(list_element_t));
-    if (filteredList->elements == NULL) {
-        free(filteredList);
+    list_t *filteredList = (list_t *)malloc(sizeof(list_t) + count * sizeof(list_element_t));
+    if (filteredList == NULL) {
         return NULL;
     }
 
-    size_t filteredIndex = 0;
-    for (size_t i = 0; i < list->length; ++i) {
+    filteredList->length = count;
+
+    for (size_t i = 0, filteredIndex = 0; i < list->length; ++i) {
         if (filter(list->elements[i])) {
             filteredList->elements[filteredIndex++] = list->elements[i];
         }
@@ -87,12 +80,6 @@ list_t *map_list(list_t *list, list_element_t (*map)(list_element_t)) {
 
     mappedList->length = list->length;
 
-    mappedList->elements = (list_element_t *)malloc(list->length * sizeof(list_element_t));
-    if (mappedList->elements == NULL) {
-        free(mappedList);
-        return NULL;
-    }
-
     for (size_t i = 0; i < list->length; ++i) {
         mappedList->elements[i] = map(list->elements[i]);
     }
@@ -140,12 +127,6 @@ list_t *reverse_list(list_t *list) {
 
     reversedList->length = list->length;
 
-    reversedList->elements = (list_element_t *)malloc(list->length * sizeof(list_element_t));
-    if (reversedList->elements == NULL) {
-        free(reversedList);
-        return NULL;
-    }
-
     for (size_t i = 0; i < list->length; ++i) {
         reversedList->elements[i] = list->elements[list->length - i - 1];
     }
@@ -155,7 +136,6 @@ list_t *reverse_list(list_t *list) {
 
 void delete_list(list_t *list) {
     if (list != NULL) {
-        free(list->elements);
         free(list);
     }
 }