lalaa

du5/Makefile

@@ -0,0 +1,13 @@
+CFLAGS= -std=c99 -g -Wall -Werror
+
+all: station
+
+%.o: %.c
+	gcc -c -o $@ $< $(CFLAGS)
+
+station: main.o a_station.o
+	gcc $(CFLAGS) main.o a_station.o -o station
+
+clean:
+	rm *.o station
+

du5/a_station.c

@@ -0,0 +1,146 @@
+#include "a_station.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * Vytvori prazdnu stanicu.
+ * Alokuje pole smernikov tracks a inicializuje ich na NULL.
+ */
+struct station* create_station() {
+    struct station* s = malloc(sizeof(struct station));
+    if (!s) return NULL;
+
+    s->track_count = STATION_SIZE;
+    s->tracks = calloc(s->track_count, sizeof(struct car*)); // všetky položky na NULL
+    if (!s->tracks) {
+        free(s);
+        return NULL;
+    }
+
+    return s;
+}
+
+/**
+ * Uvolni pamat celej databazy (vratane vsetkych spojkovych zoznamov).
+ */
+void destroy_station(struct station* s) {
+    if (!s) return;
+
+    for (int i = 0; i < s->track_count; i++) {
+        struct car* current = s->tracks[i];
+        while (current) {
+            struct car* next = current->next;
+            free(current);
+            current = next;
+        }
+    }
+
+    free(s->tracks);
+    free(s);
+}
+
+/**
+ * Jednoducha hash funkcia pre rozdelenie zaznamov do trati.
+ * Pouziva variant DJB2 hash algoritmu.
+ */
+int select_track(struct station* s, const char* target) {
+    if (!s || !target) return 0;
+
+    unsigned long hash = 5381;
+    int c;
+    while ((c = *target++))
+        hash = ((hash << 5) + hash) + c; // hash * 33 + c
+
+    return (int)(hash % s->track_count);
+}
+
+/**
+ * Prida alebo aktualizuje zaznam pre danu cielovu stanicu.
+ */
+void add_target_capacity(struct station* s, const char* target, int capacity) {
+    if (!s || !target || capacity <= 0) return;
+
+    int index = select_track(s, target);
+    struct car* current = s->tracks[index];
+    struct car* prev = NULL;
+
+    // Skontroluj, ci uz existuje
+    while (current) {
+        if (strcmp(current->value, target) == 0) {
+            current->capacity += capacity;
+            return;
+        }
+        prev = current;
+        current = current->next;
+    }
+
+    // Ak neexistuje, vytvor novy zaznam
+    struct car* new_car = malloc(sizeof(struct car));
+    if (!new_car) return;
+
+    strncpy(new_car->value, target, TARGET_SIZE - 1);
+    new_car->value[TARGET_SIZE - 1] = '\0';
+    new_car->capacity = capacity;
+    new_car->next = NULL;
+
+    if (prev)
+        prev->next = new_car;
+    else
+        s->tracks[index] = new_car;
+}
+
+/**
+ * Ziska kapacitu pre danu stanicu.
+ */
+int get_target_capacity(struct station* s, const char* target) {
+    if (!s || !target) return 0;
+
+    int index = select_track(s, target);
+    struct car* current = s->tracks[index];
+
+    while (current) {
+        if (strcmp(current->value, target) == 0)
+            return current->capacity;
+        current = current->next;
+    }
+
+    return 0;
+}
+
+/**
+ * Spocita pocet cielovych stanic (vsetky uzly vo vsetkych tratiach).
+ */
+int count_targets(struct station* s) {
+    if (!s) return 0;
+
+    int count = 0;
+    for (int i = 0; i < s->track_count; i++) {
+        struct car* current = s->tracks[i];
+        while (current) {
+            count++;
+            current = current->next;
+        }
+    }
+
+    return count;
+}
+
+/**
+ * Spocita celkovu kapacitu vsetkych zaznamov.
+ */
+int count_capacity(struct station* s) {
+    if (!s) return 0;
+
+    int sum = 0;
+    for (int i = 0; i < s->track_count; i++) {
+        struct car* current = s->tracks[i];
+        while (current) {
+            sum += current->capacity;
+            current = current->next;
+        }
+    }
+
+    return sum;
+}
+

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

du5/main.c

@@ -0,0 +1,41 @@
+#include "a_station.h"
+#include <stdio.h>
+#include <time.h>
+#include <stdlib.h>
+
+void print_station(struct station* station){
+    // Vypise celu stanicu
+    printf("station>>>\n");
+    // Prechadza vsetky trate
+    for (int i = 0 ; i< station->track_count; i++){
+        struct car* start = station->tracks[i];
+        struct car* this = start;
+        // Prechadza vsetky vozne
+        while(this != NULL){
+            printf("%s %d -> ",this->value,this->capacity);
+            this=this->next;
+        }
+        printf("NULL\n");
+    }
+    printf("<<<station\n");
+}
+// Pre overenie ci to ide v poriadku
+void test_station(struct station* station){
+   const char* stations[] = {"Presov","Kosice","Banska Bystrica","Banska Stiavnica","Povazska Bystrica","Snina","Humenne","Bratislava","Pezinok","Skalica","Ruzomberok","Bidovce","Michalovce","Poprad","Krompachy","Smizany","Vajkovce","Budimir","Modra","Myslava","Roznava","Gemerska Poloma","Stratena","Dobsina","Michalany","Kostolany"};
+   int size=26;
+   for (int i = 0; i < 50; i++){
+       int s = rand() % size;
+       int c = rand() % 20;
+       printf("%s %d\n",stations[s],c);
+       add_target_capacity(station,stations[s],c);
+       print_station(station);
+   }
+}
+
+int main(){
+   srand(time(NULL));
+   struct station* station = create_station();
+   test_station(station);
+   destroy_station(station);
+   return 0;
+}