aboutsummaryrefslogtreecommitdiff
path: root/sem3/algo/lek1/merge.c
diff options
context:
space:
mode:
authorJulian T <julian@jtle.dk>2020-10-12 16:26:42 +0200
committerJulian T <julian@jtle.dk>2020-10-12 16:54:48 +0200
commit4e05a55e373bd315e721d534a1711fec4c0054c5 (patch)
tree4fc0141760c2730ed79aaa4c7aa60ea45cc66cc0 /sem3/algo/lek1/merge.c
parentb7f9cf43c8a9ab3400cbb30d5e1cadb0c6c2cf23 (diff)
Moved to linux kernel inspired clang-format
Diffstat (limited to 'sem3/algo/lek1/merge.c')
-rw-r--r--sem3/algo/lek1/merge.c151
1 files changed, 74 insertions, 77 deletions
diff --git a/sem3/algo/lek1/merge.c b/sem3/algo/lek1/merge.c
index 945b86a..f2d908a 100644
--- a/sem3/algo/lek1/merge.c
+++ b/sem3/algo/lek1/merge.c
@@ -8,114 +8,111 @@
void printArr(int *arr, size_t len)
{
- printf("{");
- for (int i = 0; i < len; i++) {
- printf(" %d%s", arr[i], i+1 == len ? " " : ",");
- }
- printf("}\n");
+ printf("{");
+ for (int i = 0; i < len; i++) {
+ printf(" %d%s", arr[i], i + 1 == len ? " " : ",");
+ }
+ printf("}\n");
}
int *genArr(size_t len, int div)
{
- /* Make array */
- int *arr = (int *) malloc(len * sizeof(int));
+ /* Make array */
+ int *arr = (int *)malloc(len * sizeof(int));
- if (arr == NULL) {
- return NULL;
- }
+ if (arr == NULL) {
+ return NULL;
+ }
- /* Fill it with random */
- while (len--) {
- arr[len] = div - (rand() % (div*2));
- }
-
- return arr;
+ /* Fill it with random */
+ while (len--) {
+ arr[len] = div - (rand() % (div * 2));
+ }
+ return arr;
}
int mergeSort(int *arr, size_t len)
{
- /* Check if len is one(then it's sorted */
- if (len <= 1) {
- return 0;
- }
- /* Calculate array sizes */
- size_t q = len/2;
- size_t rl = len-q;
-
- /* Make arrays */
- int *left = (int *) malloc(q * sizeof(int));
- if (left == NULL) {
- return 1;
- }
- int *right = (int *) malloc(rl * sizeof(int));
- if (right == NULL) {
- return 1;
- }
-
- /* Copy data */
- memcpy(left, arr, q * sizeof(int));
- memcpy(right, arr + q, rl * sizeof(int));
-
- /* Sort each */
- mergeSort(left, q);
- mergeSort(right, rl);
-
- /* Merge them into arr */
- for (int i=0, j=0, k = 0; k < len; k++) {
- if ( i < q && ( j == rl || left[i] <= right[j] ) ) {
- arr[k] = left[ i++ ];
- } else {
- arr[k] = right[ j++ ];
- }
- }
-
- /* Free the pointers */
- free(left);
- free(right);
-
- return 0;
+ /* Check if len is one(then it's sorted */
+ if (len <= 1) {
+ return 0;
+ }
+ /* Calculate array sizes */
+ size_t q = len / 2;
+ size_t rl = len - q;
+
+ /* Make arrays */
+ int *left = (int *)malloc(q * sizeof(int));
+ if (left == NULL) {
+ return 1;
+ }
+ int *right = (int *)malloc(rl * sizeof(int));
+ if (right == NULL) {
+ return 1;
+ }
+
+ /* Copy data */
+ memcpy(left, arr, q * sizeof(int));
+ memcpy(right, arr + q, rl * sizeof(int));
+
+ /* Sort each */
+ mergeSort(left, q);
+ mergeSort(right, rl);
+
+ /* Merge them into arr */
+ for (int i = 0, j = 0, k = 0; k < len; k++) {
+ if (i < q && (j == rl || left[i] <= right[j])) {
+ arr[k] = left[i++];
+ } else {
+ arr[k] = right[j++];
+ }
+ }
+
+ /* Free the pointers */
+ free(left);
+ free(right);
+
+ return 0;
}
-void test(size_t len)
+void test(size_t len)
{
-
- int *a = genArr(len, len);
+ int *a = genArr(len, len);
#if DO_PRINT == 1
- printArr(a, len);
- printf("\n\n");
+ printArr(a, len);
+ printf("\n\n");
#endif
- clock_t begin = clock();
- mergeSort(a, len);
- clock_t end = clock();
+ clock_t begin = clock();
+ mergeSort(a, len);
+ clock_t end = clock();
#if DO_PRINT == 1
- printArr(a, len);
+ printArr(a, len);
#endif
- clock_t diff = end - begin;
- printf("Sorting %d long array took %d : %f s\n", len, diff, (double)diff/CLOCKS_PER_SEC);
+ clock_t diff = end - begin;
+ printf("Sorting %d long array took %d : %f s\n", len, diff,
+ (double)diff / CLOCKS_PER_SEC);
- free(a);
+ free(a);
}
void bench()
{
+ size_t len = SIZE_MAX;
- size_t len = SIZE_MAX;
-
- srand((unsigned) time(NULL));
- for (int i = 1; i < len; i *= 2) {
- test(i);
- }
+ srand((unsigned)time(NULL));
+ for (int i = 1; i < len; i *= 2) {
+ test(i);
+ }
}
int main(void)
{
+ bench();
- bench();
-
- return 0;
+ return 0;
}