#include<bits/stdc++.h>
#include<stack>
using namespace std;
int main() {
	stack <long long> s;
	unsigned long long t , n , x;
    cin >> t;
    string a;
    while ( t-- ) {
        cin >> n;
        for ( long long i=1; i<=n; i++ ){
            cin >> a;
            if ( a== "push" ) {
                cin >> x ;
                s . push (x) ;
            } 
			else if ( a == "pop" ){
            	if ( !s.empty() )
                	s.pop() ;
                else
                	cout << "Empty!\n" ;
            }
            else if (a == "query" ) {
            	if( !s.empty() )
            		cout << s.top() << endl ;
            	else
            		cout << "Anguei!\n" ;
			}
			else {
				cout << s.size() << endl ;
			}
        }while(!s.empty()){
        	s.pop();
		}
    }
	return 0;
}

我就搞不懂了

为什么全是WA？？？？？？？？？(╬▔皿▔)╯