Sortirana vezana lista

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;


struct node{
    int value;
    node *next;
};

typedef node *lista;

int main(){

    lista pointer = new node;
    pointer->next = NULL;

    srand(time(NULL));

    // UPISIVANJE U LISTU
    int a,i,z;
        do{
            cout << "Koliko random brojeva? ";
            cin >> a;
        } while(a<0);

    if(a>0){
    for(i=0;i<a;i++){
        z = rand();
        lista el = pointer;
        while(el->next != NULL && el->next->value<z){
            el = el->next;
        }
        lista novi = new node;
        novi->value = z;
        novi->next = el->next;
        el->next = novi;
        }
    }
    // BRISANJE IZ LISTE
    while(pointer->next != NULL){
        node *el;
        cout << pointer->next->value << " ";
        el = pointer;
        pointer = pointer->next;
        delete el;

    }




    return 0;
}