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Jana Kapalková 2026-04-23 22:11:36 +02:00
parent 64578a9e8c
commit fddb473c59
1 changed files with 91 additions and 0 deletions
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du6/a_station.c Normal file
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#include "a_station.h"
#include <stdlib.h>
#include <string.h>
struct station* create_station(){
struct station* station = (struct station*)calloc(1,sizeof(struct station));
if (station == NULL) return NULL;
station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
if (station->tracks == NULL) return free(station), NULL;
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;
if (station == NULL || target == NULL) return 0;
while (*target != '\0') {
hash = hash * 31u + (unsigned char)*target;
target++;
}
return (int)(hash % (unsigned int)station->track_count);
}
void add_target_capacity(struct station* station,const char* target, int capacity){
if (station == NULL || target == NULL) return;
int index = select_track(station, target);
struct car* current = station->tracks[index];
while (current != NULL) {
if (strcmp(current->value, target) == 0) {
current->capacity += capacity;
return;
}
current = current->next;
}
struct car* node = (struct car*)calloc(1, sizeof(struct car));
if (node == NULL) return;
strncpy(node->value, target, TARGET_SIZE - 1);
node->capacity = capacity;
node->next = station->tracks[index];
station->tracks[index] = node;
}
int get_target_capacity(struct station* station,const char* target){
if (station == NULL || target == NULL) return 0;
struct car* current = station->tracks[select_track(station, target)];
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;
if (station == NULL) return 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 sum = 0;
if (station == NULL) return 0;
for (int i = 0; i < station->track_count; i++) {
struct car* current = station->tracks[i];
while (current != NULL) {
sum += current->capacity;
current = current->next;
}
}
return sum;
}