dom.uloha

du5/a_station.c

@@ -0,0 +1,118 @@
+#include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+
+struct station* create_station(){
+   struct station* station = (struct station*)calloc(1,sizeof(struct station));
+   station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
+   station->track_count = STATION_SIZE;
+   return station;
+}
+
+void destroy_station(struct station* station){
+	if (station == NULL) return;
+
+        for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+
+        
+        while (current != NULL) {
+            struct car* next = current->next;
+            free(current);
+            current = next;
+        }
+    }
+
+    
+    free(station->tracks);
+
+    
+    free(station);
+}
+
+int select_track(struct station* station, const char* target){
+    	unsigned int hash = 0;
+
+    // Jednoduché hashovanie: sčítame všetky znaky
+    for (int i = 0; target[i] != '\0'; i++) {
+        hash += (unsigned char)target[i];
+    }
+
+    // Prevedieme hash na index v poli
+    return hash % station->track_count;
+}
+
+void add_target_capacity(struct station* station,const char* target, int capacity){
+	int track = select_track(station, target);
+	struct car* current = station->tracks[track];
+
+	    // 1. Ak je spojkový zoznam prázdny
+	if (current == NULL) {
+		struct car* new_car = calloc(1, sizeof(struct car));
+		strcpy(new_car->value, target);
+		new_car->capacity = capacity;
+		new_car->next = NULL;
+		station->tracks[track] = new_car;
+		return;
+	    }
+
+	    // 2. Prejdeme zoznam
+	    struct car* prev = NULL;
+	    while (current != NULL) {
+		if (strcmp(current->value, target) == 0) {
+		    current->capacity += capacity;  
+		    return;
+		}
+		prev = current;
+		current = current->next;
+	    }
+
+	    // 3. Ak záznam neexistuje → pridáme nový na koniec
+	    struct car* new_car = calloc(1, sizeof(struct car));
+	    strcpy(new_car->value, target);
+	    new_car->capacity = capacity;
+	    new_car->next = NULL;
+
+	    prev->next = new_car;
+}
+
+int get_target_capacity(struct station* station,const char* target){
+    int track = select_track(station, target);
+    struct car* current = station->tracks[track];
+
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            return current->capacity;
+        }
+        current = current->next;
+    }
+    return 0;
+}
+
+int count_targets(struct station* station){
+	int count = 0;
+
+	for (int i = 0; i < station->track_count; i++) {
+		struct car* current = station->tracks[i];
+		while (current != NULL) {
+	    		count++;
+	    		current = current->next;
+		}
+	}
+
+	return count;
+}
+
+int count_capacity(struct station* station){
+	int total = 0;
+	for (int i = 0; i < station->track_count; i++) {
+		struct car* current = station->tracks[i];
+		while (current != NULL) {
+			total += current->capacity;
+			current = current->next;
+        }
+    }
+
+    return total;
+}
+

du5/a_station.h

@@ -0,0 +1,91 @@
+#ifndef STATION_H
+#define STATION_H
+// Pocet trati k dispozicii
+#define STATION_SIZE 10
+// Maximalny pocet znakov pre ulozenie nazvu cielovej stanice
+#define TARGET_SIZE 36
+
+/**
+ * Jeden zaznam o kapacite do cielovej stanice
+ */
+struct car {
+    // Cielova stanica / nazov
+    char value[TARGET_SIZE];
+    // Pocet cestujuchich
+    int capacity;
+    // Smernik na dalsi zaznam
+    struct car* next;
+};
+
+/**
+ * Cela databaza zaznamov
+ */
+struct station {
+    // Dynamicke pole smernikov na zaznamy
+    // jeden zaznam ma typ struct car*
+    struct car** tracks;
+    // Velkost pola tracks
+    int track_count;
+};
+
+
+/**
+ * Vytvori prazdnu stanicu.
+ * Alokuje pole smernikov tracks na pociatocnu kapacitu STATION_SIZE
+ * nastavi velkost capacity na STATION_SIZE
+ * @return smernik na prazdnu stanicu
+ */
+struct station* create_station();
+
+/**
+ * Uvolni pamat
+ * @param smernik na databazu
+ */
+void destroy_station(struct station* station);
+
+/**
+ * Vyberie poziciu v poli station->tracks pre ulozenie zaznamu target
+ *
+ * Proces vyberu by mal splnat kriteria pre hash funkciu:
+ * - rovnaky retazec by mal vzdy mat rovnaky vysledok
+ * - pre rozne retazce by mali byt vysledky co najviac rozne
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ * @return cislo v intervale 0 az N-1, kde N je  station->track_count
+ */
+int select_track(struct station* station, const char* target);
+
+/**
+ * Zvysi zaznam o pocte cestujucich do danej cielovej stanice.
+ *
+ * Najprv sa vyberie cielova trat pomocou select_track(). Ak zaznam neexistuje, 
+ * vytvori sa novy. Ak zaznam na danej trati (spojkovom zozname) existuje, cislo sa pripocita.
+ * V databaze nesmu byt dva zaznamy s rovnakou cielovou stanicou.
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ */
+void add_target_capacity(struct station* station,const char* target, int capacity);
+
+/**
+ * Ziska zaznam o cielovej stanici.
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ *
+ * @return kapacitu do cielovej stanice. Ak sa zaznam nenachedza, vrati nula.
+ */
+int get_target_capacity(struct station* station,const char* target);
+
+/**
+ * Spocita pocet cielovych stanic
+ * @param smernik na databazu
+ */
+int count_targets(struct station* station);
+
+/**
+ * Spocita kapacitu vo vsetkych zaznamoch
+ * @param smernik na databazu
+ */
+int count_capacity(struct station* station);
+#endif