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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4.  
  5. ll n;
  6. stack<ll> st;
  7.  
  8. int main(){
  9. 	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  10. 	cin >> n;
  11. 	for(int i=1; i<=n; i++){
  12. 		ll j; cin >> j;
  13. 		if(j == 1){
  14. 			ll a; cin >> a;
  15. 			st.push(a);
  16. 		}
  17. 		else if(j == 2) st.pop();
  18. 		else{
  19. 			if(st.empty()) cout << "Empty!" << '\n';
  20. 			else cout << st.top() << '\n';
  21. 		}
  22. 	}
  23. }
Success #stdin #stdout 0.01s 5504KB
comments (?)
stdin
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6
1 15
1 20
2
3
2
3
stdout
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15
Empty!
https://ideone.com/GUO16d
language:
C++ (gcc 8.3)
created:
326 days ago
visibility:
public

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