Update du6/list_ops.c

This commit is contained in:
Martin Kačmár 2025-04-17 20:25:05 +00:00
parent 4cb9c25dc1
commit 76ab518fd0

View File

@ -1,6 +1,6 @@
#include <stdlib.h>
#include <stddef.h>
#include <stdbool.h> // pre bool
#include <stdlib.h>
#include <stddef.h>
#include <stdbool.h>
typedef int list_element_t;
@ -9,109 +9,128 @@ typedef struct {
list_element_t elements[];
} list_t;
// ==== Deklarácie funkcií (tzv. prototypy) ====
// Deklarácie funkcií
list_t *new_list(size_t length, list_element_t default_value);
list_t *map_list(list_t *list, list_element_t (*map_fn)(list_element_t));
list_t *filter_list(list_t *list, bool (*filter_fn)(list_element_t));
list_element_t foldl_list(list_t *list, list_element_t initial, list_element_t (*fold_fn)(list_element_t, list_element_t));
list_element_t foldr_list(list_t *list, list_element_t initial, list_element_t (*fold_fn)(list_element_t, list_element_t));
list_element_t foldl_list(list_t *list, list_element_t initial,
list_element_t (*fold_fn)(list_element_t, list_element_t));
list_element_t foldr_list(list_t *list, list_element_t initial,
list_element_t (*fold_fn)(list_element_t, list_element_t));
list_t *reverse_list(list_t *list);
void delete_list(list_t *list);
list_t *append_list(list_t *list1, list_t *list2);
size_t length_list(list_t *list);
// ==== Implementácie ====
// Vytvorí nový zoznam a naplní ho default hodnotou
list_t *new_list(size_t length, list_element_t default_value) {
list_t *list = malloc(sizeof(list_t) + length * sizeof(list_element_t));
if (list == NULL) {
return NULL;
}
if (!list) return NULL;
list->length = length;
for (size_t i = 0; i < length; i++) {
list->elements[i] = default_value;
}
return list;
}
// Mapovanie: aplikuje funkciu na každý prvok zoznamu
list_t *map_list(list_t *list, list_element_t (*map_fn)(list_element_t)) {
list_t *result = malloc(sizeof(list_t) + sizeof(list_element_t) * list->length);
if (result == NULL) {
return NULL;
}
result->length = list->length;
list_t *new = malloc(sizeof(list_t) + list->length * sizeof(list_element_t));
if (!new) return NULL;
new->length = list->length;
for (size_t i = 0; i < list->length; i++) {
result->elements[i] = map_fn(list->elements[i]);
new->elements[i] = map_fn(list->elements[i]);
}
return result;
return new;
}
// Filter: ponechá len tie prvky, ktoré spĺňajú podmienku
list_t *filter_list(list_t *list, bool (*filter_fn)(list_element_t)) {
size_t count = 0;
// Zistíme koľko prvkov prejde filtrom
for (size_t i = 0; i < list->length; i++) {
if (filter_fn(list->elements[i])) {
count++;
}
}
list_t *result = malloc(sizeof(list_t) + sizeof(list_element_t) * count);
if (result == NULL) {
return NULL;
}
list_t *filtered = malloc(sizeof(list_t) + count * sizeof(list_element_t));
if (!filtered) return NULL;
result->length = count;
size_t index = 0;
filtered->length = count;
size_t j = 0;
for (size_t i = 0; i < list->length; i++) {
if (filter_fn(list->elements[i])) {
result->elements[index] = list->elements[i];
index++;
filtered->elements[j++] = list->elements[i];
}
}
return result;
return filtered;
}
list_element_t foldl_list(list_t *list, list_element_t initial, list_element_t (*fold_fn)(list_element_t, list_element_t)) {
// Foldl: zľava doprava
list_element_t foldl_list(list_t *list, list_element_t initial,
list_element_t (*fold_fn)(list_element_t, list_element_t)) {
list_element_t acc = initial;
for (size_t i = 0; i < list->length; i++) {
acc = fold_fn(acc, list->elements[i]);
}
return acc;
}
list_element_t foldr_list(list_t *list, list_element_t initial, list_element_t (*fold_fn)(list_element_t, list_element_t)) {
// Foldr: sprava doľava
list_element_t foldr_list(list_t *list, list_element_t initial,
list_element_t (*fold_fn)(list_element_t, list_element_t)) {
list_element_t acc = initial;
for (size_t i = list->length; i > 0; i--) {
acc = fold_fn(list->elements[i - 1], acc);
// pozor: `size_t` nemôže byť záporné, takže kontrolujeme ručne
for (size_t i = list->length; i-- > 0;) {
acc = fold_fn(list->elements[i], acc);
}
return acc;
}
// Otočí zoznam
list_t *reverse_list(list_t *list) {
list_t *result = malloc(sizeof(list_t) + sizeof(list_element_t) * list->length);
if (result == NULL) {
return NULL;
}
list_t *reversed = malloc(sizeof(list_t) + list->length * sizeof(list_element_t));
if (!reversed) return NULL;
result->length = list->length;
reversed->length = list->length;
for (size_t i = 0; i < list->length; i++) {
result->elements[i] = list->elements[list->length - 1 - i];
reversed->elements[i] = list->elements[list->length - 1 - i];
}
return reversed;
}
// Uvoľní pamäť zoznamu
void delete_list(list_t *list) {
free(list);
}
// Spojí dva zoznamy
list_t *append_list(list_t *list1, list_t *list2) {
size_t new_length = list1->length + list2->length;
list_t *result = malloc(sizeof(list_t) + new_length * sizeof(list_element_t));
if (!result) return NULL;
result->length = new_length;
for (size_t i = 0; i < list1->length; i++) {
result->elements[i] = list1->elements[i];
}
for (size_t i = 0; i < list2->length; i++) {
result->elements[list1->length + i] = list2->elements[i];
}
return result;
}
void delete_list(list_t *list) {
free(list);
}
// Vráti dĺžku zoznamu
size_t length_list(list_t *list) {
return list->length;
}