多测不清空，情人亲人两行泪。
详见代码：

#include <bits/stdc++.h>
using namespace std;
vector <unsigned long long> v;
int main() {
	int t;
	cin>>t;
	while (t--){
		int n;
		cin>>n;
		string s;
		for (int i=0;i<n;++i){
			cin>>s;
			if (s=="push"){
				unsigned long long x;
				cin>>x;
				v.push_back(x);
			}
			else{
				if (s=="pop"){
					if (v.size())v.pop_back();
					else cout<<"Empty"<<endl;
				}
				else if(s=="size")
					cout<<v.size()<<endl;
				else{
					if (!v.size())
						cout<<"Anguei!"<<endl;
					else
						cout<<v[v.size()-1]<<endl;
				}
			}
		}
	}
	return 0;
}

66pts