stack
#include <stack>
stack<int> s;
s.push(a);
while(!s.empty)
{
cout<<s.top();
s.pop();
}
int size=s.size();
#include <stack>
stack<int> s;
s.pushstack
#include <stack>
stack<int> s;
s.push(a);
while(!s.empty)
{
cout<<s.top();
s.pop();
}
int size=s.size();
#include <stack>
stack<int> s;
s.push