diff --git a/cv6/Makefile b/cv6/Makefile new file mode 100644 index 0000000..8cec7f4 --- /dev/null +++ b/cv6/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 + diff --git a/cv6/a_station.c b/cv6/a_station.c new file mode 100644 index 0000000..a90e856 --- /dev/null +++ b/cv6/a_station.c @@ -0,0 +1,134 @@ +#include "a_station.h" +#include +#include + +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* this = station->tracks[i]; + while (this != NULL) + { + struct car* temp = this; + this = this->next; + free(temp); + } + } + + free(station->tracks); + free(station); +} + +int select_track(struct station* station, const char* target) +{ + unsigned int hash = 0; + int prime = 36; + + for (size_t i = 0; i < strlen(target); i++) + { + hash = hash * prime + (unsigned char)target[i]; + } + + return hash % station->track_count; +} + +void add_target_capacity(struct station* station, const char* target, int capacity) +{ + int stIndex = select_track(station, target); + struct car* start = station->tracks[stIndex]; + + struct car* this = start; + while (this != NULL) + { + + if (strcmp(this->value, target) == 0) + { + this->capacity += capacity; + return; + } + this = this->next; + } + + + struct car* nCar = (struct car*)malloc(sizeof(struct car)); + if (nCar == NULL) + { + return; + } + + strncpy(nCar->value, target, TARGET_SIZE - 1); + nCar->value[TARGET_SIZE - 1] = '\0'; + nCar->capacity = capacity; + nCar->next = start; + + station->tracks[stIndex] = nCar; +} + + +int get_target_capacity(struct station* station,const char* target) +{ + int indTr = select_track(station, target) % station->track_count; + struct car* this = station->tracks[indTr]; + + while (this != NULL) + { + if (strcmp(this->value, target) == 0) + { + return this->capacity; + } + this = this->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 res = 0; + + for (int i = 0; i < station->track_count; i++) + { + struct car* current = station->tracks[i]; + + while (current != NULL) + { + res += current->capacity; + current = current->next; + } + } + + return res; +} + + diff --git a/cv6/a_station.h b/cv6/a_station.h new file mode 100644 index 0000000..ce8c733 --- /dev/null +++ b/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 diff --git a/cv6/main.c b/cv6/main.c new file mode 100644 index 0000000..a909625 --- /dev/null +++ b/cv6/main.c @@ -0,0 +1,41 @@ +#include "a_station.h" +#include +#include +#include + +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("<<