以下是代码：

#include<bits/stdc++.h>
using namespace std;
int t,n;string opt;long long x;
stack<int> s;
void solve(){
    scanf("%d",&n);
    while(n--){
        cin>>opt;
        if(opt=="push"){
            scanf("%lld",&x);
            s.push(x);
        }
        else if(opt=="pop"){
            if(s.empty()) printf("Empty\n");
            else s.pop();
        }
        else if(opt=="query"){
            if(s.empty()) printf("Anguei!\n");
            else printf("%lld",&s.top());
        }
        else printf("%d",&s.size());
    }
}

int main(){
    scanf("%d",&t);
    while(t--) solve();
    return 0;
}

以下是编译信息：

/tmp/compiler_tuliro_a/src: 在函数‘void solve()’中:
/tmp/compiler_tuliro_a/src:19:29: 警告：格式 ‘%lld’ expects argument of type ‘long long int’, but argument 2 has type ‘__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type*’ {aka ‘int*’} [-Wformat=]
   19 |             else printf("%lld",&s.top());
      |                          ~~~^  ~~~~~~~~
      |                             |  |
      |                             |  __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type* {aka int*}
      |                             long long int
      |                          %n
/tmp/compiler_tuliro_a/src:21:34: 错误：单目‘&’的操作数必须是左值
   21 |         else printf("%d",&s.size());
      |                                  ^