why???
#include <iostream>
//#include <stdlib.h>
//#include <stdio.h>
#include <string.h>
using namespace std;
int i,o,tp,nm;
struct Tpart
{
    int val [24];
    int k;
    Tpart *lst;

};
char com[100];
Tpart stk[1024];
int Pop(Tpart *p)
{
    if(p->k>0) return p->val[--(p->k)];
    else
    {
        Tpart *e=p;
    p=p->lst;
    delete e;
    return p->val[--(p->k)];
    }};
void Push(Tpart *p, int val)
{
    if((p->k)<24) (p->val)[(p->k)++]=val;
        else
    {
        Tpart *uk= new Tpart;
        uk->lst=p;
        p=uk;
        p->k=0;
        (p->val)[(p->k)++]=val;
        }
    return;
}
int main() {

    int n; cin>>n;
    for(int j=0;j<n;j++)
    {
        cin>>com;
        if (strcmp(com,"PUSH")==0)
        {
            cin>>nm>>tp;
            Push(&stk[nm-1],tp);
            }
        if (strcmp(com,"POP")==0)
                {
                    cin>>nm;
                    cout<<Pop(&stk[nm-1])<<endl;}
        }
    return 0;
}

I've this problem too((