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  1. #include<bits/stdc++.h>
  2. #define FAST()                  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  3. #define loop(n)                 for (int i = 0; i < n; i++)
  4. #define loop2(n)               for (int j = 0; j < n; j++)
  5. #define fr(i, a, n)                for(int i = a; i <= n; i++)
  6. #define pb                         push_back
  7. #define all(v)                      v.begin(),v.end()
  8. #define sz(v)                      ((int) ((v).size()))
  9. #define in(v,n)                    for(int i=0 ;i<n;i++) cin>>v[i];
  10. #define out(v,n)                 for(int i=0;i<n;i++) cout << v[i] <<" ";
  11. #define el                           cout<<endl;
  12. #define pi                          3.14159265359
  13. typedef long long    ll;
  14. //typedef vector<int> vi;
  15. using namespace std;
  16.  
  17. bool prec (int x, int y)
  18. {
  19.     return x>y;
  20. }
  21. //LCM(a,b) = (a*b) /  gcd(a,b)
  22. int gcd(int a,int b);
  23. ll fastpower(ll b,ll p);
  24. void selection_Sort(int arr[], int n);
  25. void Bubble_sort(int arr[], int n);
  26. bool isPrime(int n);
  27. int maxElement(stack<int> x )
  28. {
  29.     int mx=0;
  30.     while(!x.empty())
  31.     {
  32.         if(x.top() > mx)
  33.             mx = x.top();
  34.         x.pop();
  35.     }
  36.     return mx;
  37. }
  38. void solve()
  39. {
  40.     int n,x,mx=0,q;
  41.     cin>>n;
  42.     stack<int> s;
  43.     multiset<int, greater<int>> se;
  44.     while(n--)
  45.     {
  46.         cin>>q;
  47.         if(q==1)
  48.         {
  49.             cin>>x;
  50.             s.push(x);
  51.         }
  52.         else if(q==2)
  53.         {
  54.             if(!s.empty())
  55.             {
  56.                 s.pop();
  57.             }
  58.         }
  59.         else
  60.         {
  61.             cout<<maxElement(s)<<endl;
  62.         }
  63.     }
  64. }
  65. int main()
  66. {
  67.     FAST()
  68.     int t;
  69. //    cin>>t;
  70. //    while(t--)
  71.         solve();
  72.     return 0;
  73. }
Success #stdin #stdout 0.01s 5264KB
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https://ideone.com/viU2hX
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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