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  1. /// Spoj Easy Stack
  2. #include <bits/stdc++.h>
  3. #define X first
  4. #define Y second
  5. #define pb push_back
  6. using namespace std;
  7. typedef long long ll;
  8. typedef pair <int,int> ii;
  9. typedef pair <int,ii> i_ii;
  10. typedef vector <int> vi;
  11. typedef vector <ii> vii;
  12.  
  13. const int maxn=102;
  14. const ll MOD=1000000007;
  15.  
  16. stack <int> st;
  17. int T;
  18.  
  19. int main()
  20. {
  21. //    freopen("nhap.inp", "r", stdin);
  22.     scanf("%d",&T);
  23.     while (T--)
  24.     {
  25.         int type,x;
  26.         scanf("%d",&type);
  27.         if (type == 1)
  28.         {
  29.             scanf("%d",&x);
  30.             st.push(x);
  31.         }
  32.         if (type == 2 && !st.empty())
  33.             st.pop();
  34.         if (type == 3)
  35.             if (st.empty()) printf("Empty!\n");
  36.             else printf("%d\n",st.top());
  37.     }
  38.     return 0;
  39. }
  40.  
Success #stdin #stdout 0s 4572KB
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https://ideone.com/jNWz6b
Spoj Easy Stack
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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