程序

#include<bits/stdc++.h>
using namespace std;
stack<unsigned long long> a;
int main()
{
	int t;
	cin>>t;
	for(int i=0;i<t;i++)
	{
		int n;
		cin>>n;
		for(int j=0;j<n;j++)
		{
			string b;
			cin>>b;
			if(b=="push")
			{
				unsigned long long c;
				cin>>c;
				a.push(c);
			}
			if(b=="pop")
			{
				if(!a.empty())
				{
					a.pop();
				}
				else
				{
					cout<<"Empty"<<endl;
				}
			}
			if(b=="query")
			{
				if(!a.empty())
				{
					cout<<a.top()<<endl;
				}
				else
				{
					cout<<"Anguei!"<<endl;
				}
			}
			if(b=="size")
			{
				cout<<a.size()<<endl;
			}
			while(!a.empty())
			{
				a.pop();
			}
		}
	}
	return 0;
}