rt

Code

#include<bits/stdc++.h>
#define ull unsigned long long
using namespace std;
int main(){
	int T;
	cin>>T;
	while(T--){
		stack<ull int>s;
		int n;
		scanf("%d",&n);
		while(n--){
			string op;
			cin>>op;
			if(op=="push"){
				ull x;
				scanf("%d",&x);
				s.push(x);
			}
			else if(op=="pop"){
				if(s.empty())	cout<<"Empty\n";
				else s.pop();
			}
			else if(op=="query"){
				if(s.empty())	cout<<"Anguei!\n"; 
				else cout<<s.top()<<endl;
			}
			else cout<<s.size()<<endl;
		}
	}
	return 0;
}