sitva

#include <iostream>
#include <cstring>

using namespace std;
struct nod
{
    int x;
    nod *adr;
};
nod *p, *prim;
void push (nod *&prim, int nr)
{
    if (prim==NULL)
    {
        prim = new nod;
        prim->x=nr;
        prim->adr=NULL;
    }
    else
    {
        p = new nod;
        p->x=nr;
        p->adr=prim;
        prim=p;
    }
}
void pop (nod *&prim)
{
        p=prim;
        prim=prim->adr;
        delete p;
}
int top (nod *&prim)
{
    cout<<prim->x<<endl;;
}
void afisare (nod *&prim)
{
    p=prim;
    while (p)
    {
        cout<<p->x<<endl;
        p=p->adr;
    }
}

int main()
{
    int n, x;
    cin>>n;
    char c[100];
    for (int i=0;i<n;++i)
    {
        cin>>c;
        if (strcmp(c,"push")==0)
            {
                cin>>x;
                push(prim,x);
            }
        if (strcmp(c,"pop")==0&&prim!=NULL)
            pop(prim);
        if (strcmp(c,"top")==0&&prim!=NULL)
            top(prim);
    }
    afisare(prim);
    return 0;
}