using namespace std;

int st[100000]; int top=-1;

void push() { int input; cin>>input;

st[++top]=input; //cout<<"in push :"<

} void pop() { st[top]=' '; top--;

} void display() { cout<<"\nDisplay "; cout<

for(i=0;i<=top;i++)
   { 
    if(st[i]>max)
    max=st[i];
   }
cout<<max<<"\n";

}

int main() {

int j; j=0;
int n; int option;
cin>>n;
while(j<n)
{
cin>>option;
    switch(option)
    {

        case 1:
        {
         push();
         //display();
        }
        break;
        case 2:
        {pop();
         //display();
        }
        break;
        case 3:
        {max();
         //display();
        }
        break;
    }
    j++;
}




return 0;

}

Facing timeout problem at the end! Please help :P