108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
#include "a_station.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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struct station* create_station(){
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struct station* station = (struct station*)calloc(1,sizeof(struct station));
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station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
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station->track_count = STATION_SIZE;
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return station;
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}
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void destroy_station(struct station* station){
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free(station->tracks);
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free(station);
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}
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int select_track(struct station* station, const char* target){
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unsigned int hash = 0;
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for (int i = 0; i < strlen(target); i++)
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{ hash += target[i] + (hash<<6) + (hash<<16) - hash;
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}
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hash = hash %station->track_count;
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return hash;
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}
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void add_target_capacity(struct station* station,const char* target, int capacity){
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int res = select_track(station, target);
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struct car* previous = NULL;
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struct car** ptr = &station->tracks[res];
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struct car* head = *ptr;
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while(head){
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if(strcmp(head->value, target) == 0){
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head->capacity += capacity;
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return;
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}
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previous = head;
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head = head->next;
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}
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struct car* next = (struct car*)calloc(1, sizeof(struct car));
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strcpy(next->value, target);
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next->capacity = capacity;
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if(previous){
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previous->next = next;
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}
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else{
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*ptr = next;
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}
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}
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int get_target_capacity(struct station* station,const char* target){
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int res = select_track(station, target);
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struct car** ptr = &station->tracks[res];
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struct car* head = *ptr;
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while (head)
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{if(strcmp(head->value, target) == 0){
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return head->capacity;
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}
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head = head->next;
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}
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return 0;
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}
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int count_targets(struct station* station){
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if(station == NULL || station->tracks == NULL){
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return 0;
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}
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int total = 0;
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for(int i = 0; i<station->track_count; i++){
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struct car* ptr = station->tracks[i];
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while(ptr){
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total++;
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ptr = ptr->next;
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}
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}
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return total;
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}
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int count_capacity(struct station* station){
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if(station == NULL || station->tracks == NULL){
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return 0;
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}
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int total = 0;
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for(int i = 0; i<station->track_count; i++){
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struct car* ptr = station->tracks[i];
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while(ptr){
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total += ptr->capacity;
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ptr = ptr->next;
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}
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}
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return total;
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}
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