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cv6/Makefile

@@ -0,0 +1,17 @@
+CC = gcc
+CFLAGS = -Wall -Werror -std=c99
+
+all: main
+
+main: main.o a_station.o
+    $(CC) $(CFLAGS) -o main main.o a_station.o
+
+main.o: main.c a_station.h
+    $(CC) $(CFLAGS) -c main.c
+
+a_station.o: a_station.c a_station.h
+    $(CC) $(CFLAGS) -c a_station.c
+
+clean:
+    rm -f *.o main
+

cv6/a_station.c

@@ -0,0 +1,90 @@
+#include <stdlib.h>
+#include <string.h>
+#include "a_station.h"
+
+struct station* create_station() {
+    struct station* new_station = malloc(sizeof(struct station));
+    if (!new_station) return NULL;
+
+    new_station->tracks = calloc(STATION_SIZE, sizeof(struct car*));
+    new_station->track_count = STATION_SIZE;
+    return new_station;
+}
+
+void destroy_station(struct station* station) {
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current) {
+            struct car* temp = current;
+            current = current->next;
+            free(temp);
+        }
+    }
+    free(station->tracks);
+    free(station);
+}
+
+int select_track(struct station* station, const char* target) {
+    int hash = 0;
+    for (int i = 0; target[i] != '\0'; i++) {
+        hash = (hash * 31 + target[i]) % station->track_count;
+    }
+    return hash;
+}
+
+void add_target_capacity(struct station* station, const char* target, int capacity) {
+    int index = select_track(station, target);
+    struct car* current = station->tracks[index];
+
+    while (current) {
+        if (strcmp(current->value, target) == 0) {
+            current->capacity += capacity;
+            return;
+        }
+        current = current->next;
+    }
+
+    struct car* new_car = malloc(sizeof(struct car));
+    strncpy(new_car->value, target, TARGET_SIZE);
+    new_car->capacity = capacity;
+    new_car->next = station->tracks[index];
+    station->tracks[index] = new_car;
+}
+
+int get_target_capacity(struct station* station, const char* target) {
+    int index = select_track(station, target);
+    struct car* current = station->tracks[index];
+
+    while (current) {
+        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) {
+            count++;
+            current = current->next;
+        }
+    }
+    return count;
+}
+
+int count_capacity(struct station* station) {
+    int total_capacity = 0;
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current) {
+            total_capacity += current->capacity;
+            current = current->next;
+        }
+    }
+    return total_capacity;
+}
+

cv6/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

cv6/main.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include "a_station.h"
+
+int main() {
+    struct station* station = create_station();
+
+    add_target_capacity(station, "Bratislava", 100);
+    add_target_capacity(station, "Kosice", 150);
+    add_target_capacity(station, "Bratislava", 50);
+
+    printf("Capacity to Bratislava: %d\n", get_target_capacity(station, "Bratislava"));
+    printf("Total number of targets: %d\n", count_targets(station));
+    printf("Total capacity: %d\n", count_capacity(station));
+
+    destroy_station(station);
+    return 0;
+}
+