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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.      std::ios::sync_with_stdio(false);
  6.      cin.tie(0);
  7.     int key,t,n;
  8.     stack<int>p;
  9.     cin>>t;
  10.     while (t-->0)
  11.     {
  12.         cin>>key;
  13.         if (key==1)
  14.         {
  15.             cin>>n;
  16.             p.push(n);
  17.         }
  18.         else
  19.             if (key==2)
  20.             {
  21.                 if (!p.empty())p.pop();
  22.             }
  23.         else
  24.         if (key==3)
  25.         {
  26.             if (!p.empty()) cout<<p.top()<<endl;
  27.             else cout<<"Empty!"<<endl;
  28.         }
  29.     }
  30.     return 0;
  31. }
  32.  
Success #stdin #stdout 0s 4500KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/nPYq6a
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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