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  1. #include <iostream>
  2. #include <stack>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int q;
  7.     cin>>q;
  8.     stack<int> s;
  9.     stack<int> max;
  10.     for(int i=0;i<q;i++)
  11.     {
  12.     	char query;
  13.         cin>>query;
  14.         if(query=='A')
  15.         {
  16.         	int detail;
  17.             cin>>detail;
  18.             s.push(detail);
  19.             if(max.empty())
  20.                 max.push(detail);
  21.             else if(detail>max.top())
  22.                 max.push(detail);
  23.         }
  24.         else if(query=='R')
  25.         {
  26.             if(!s.empty())
  27.             {
  28.                 if(s.top()==max.top())
  29.                     max.pop();
  30.                 s.pop();
  31.             }
  32.         }
  33.         else
  34.         {
  35.             if(max.empty())
  36.                 cout<<"Empty\n";
  37.             else
  38.                 cout<<max.top()<<"\n";
  39.         }
  40.     }
  41. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
4 A 1 A 1 R Q
stdout 
Empty
https://ideone.com/2BrQUt
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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