#include <iostream>

using namespace std;

struct product{
    char nazwa[30];
    int category;
    double price;
} ;
struct node{
struct product *date;
struct node *next;
};
node *f1(char * path){
ifstream plik;
plik.open(path);
if(plik==NULL)return NULL;
node * first==NULL;
int category;
char nazwa[30];
double price;
while(plik>>category&&plik>>nazwa&&plik>>price)==3{
    if(!list_find(first,name))
        list_add(&first,category,name,price);
}
plik.close();
return first;
}

bool list_find(node *first; char * name){
while(first){
    if(strcmp(first->date->name;name)==0){
        return true;
    }
    first=first->next;
}
return 0;
}
void list_add(node **first int category,char *nazwa, double price){
new node * n=(node *)malloc(sizeof(node));
node->date=(product*)malloc(sizeof(product));
n->date->category=category;
n->date->price=price;
strcpy(n->date->name,name);
n->next=*first;
*first=n;
}