xxx

#include <stdio.h>
#include <stdlib.h>





int main()
{
    printf("Hello world!\n");
    return 0;
}
struct item{
item *next;
int x;

};



struct stack{
item *head;

};

//void push (x){
//if (!head){

//stack->x = x;
//stack->next = &head
//head=malloc(sizeof(item));
//}


//}