“program”

cv10/program.c

@@ -2,96 +2,86 @@
 #include <stdlib.h>
 #include <string.h>
 
-int compare_strings(const void *a, const void *b) {
-    const char *str1 = *(const char **)a;
-    const char *str2 = *(const char **)b;
-    return strcmp(str1, str2);
+#define MAX_NAME_LENGTH 100
+
+int compare(const void *a, const void *b) {
+    const char *name1 = *(const char **)a;
+    const char *name2 = *(const char **)b;
+    return strcmp(name1, name2);
 }
 
 int main() {
-    int max_students, read;
-    char buffer[101];
+    int max_students;
+    char name[MAX_NAME_LENGTH];
     char **names = NULL;
-    size_t count = 0;
-    size_t capacity = 0;
+    int size = 0, capacity = 10;
 
-
-    if (scanf("%d", &max_students) != 1 || max_students <= 0) {
-        puts("Nespravny vstup");
+    names = (char **)malloc(capacity * sizeof(char *));
+    if (names == NULL) {
+        puts("Memory allocation error");
         return 1;
     }
 
-
-    while (fgets(buffer, sizeof(buffer), stdin)) {
-
-        buffer[strcspn(buffer, "\n")] = 0;
-        if (strlen(buffer) == 0) break; 
-
-
-        if (count == capacity) {
-            capacity = capacity == 0 ? 16 : capacity * 2;
-            char **new_names = realloc(names, capacity * sizeof(char *));
-            if (!new_names) {
-                puts("Memory allocation failed");
-                free(names);
-                return 1;
-            }
-            names = new_names;
-        }
-
-
-        names[count] = strdup(buffer);
-        if (!names[count]) {
-            puts("Memory allocation failed");
-            while (count > 0) free(names[--count]);
-            free(names);
-            return 1;
-        }
-        count++;
+    if (scanf("%d\n", &max_students) != 1 || max_students <= 0) {
+        puts("Nespravny vstup");
+        free(names);
+        return 1;
     }
 
-    if (count == 0) {
+    while (fgets(name, MAX_NAME_LENGTH, stdin) != NULL) {
+        if (name[0] == '\n') break;
+        name[strcspn(name, "\n")] = 0;
+
+        int duplicate = 0;
+        for (int i = 0; i < size; i++) {
+            if (strcmp(names[i], name) == 0) {
+                duplicate = 1;
+                break;
+            }
+        }
+        if (duplicate) continue;
+
+        if (size == capacity) {
+            capacity *= 2;
+            names = (char **)realloc(names, capacity * sizeof(char *));
+            if (names == NULL) {
+                puts("Memory allocation error");
+                return 1;
+            }
+        }
+
+        names[size] = strdup(name);
+        if (names[size] == NULL) {
+            puts("Memory allocation error");
+            return 1;
+        }
+        size++;
+    }
+
+    if (size == 0) {
         puts("Ziadne prihlasky");
         free(names);
         return 1;
     }
 
-
-    qsort(names, count, sizeof(char *), compare_strings);
-
-
-    size_t unique_count = 0;
-    for (size_t i = 0; i < count; i++) {
-        if (unique_count == 0 || strcmp(names[unique_count - 1], names[i]) != 0) {
-            names[unique_count++] = names[i];
-        } else {
-            free(names[i]);
-        }
-    }
-
+    qsort(names, size, sizeof(char *), compare);
 
     puts("Prijati studenti:");
-    size_t limit = max_students < unique_count ? max_students : unique_count;
-    for (size_t i = 0; i < limit; i++) {
+    int accepted = size < max_students ? size : max_students;
+    for (int i = 0; i < accepted; i++) {
         puts(names[i]);
     }
 
-
-    if (limit < unique_count) {
+    if (size > max_students) {
         puts("Neprijati studenti:");
-        for (size_t i = limit; i < unique_count; i++) {
+        for (int i = max_students; i < size; i++) {
             puts(names[i]);
-            free(names[i]);
         }
     }
 
-
-    for (size_t i = 0; i < limit; i++) {
+    for (int i = 0; i < size; i++) {
         free(names[i]);
     }
-    
-
     free(names);
     return 0;
 }
-