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  1.  
  2. #include<iostream>
  3.  
  4. using namespace std;
  5.  
  6. class Stack{
  7. private:
  8.     int top;
  9.     int capacity;
  10.     int size;
  11.     string *arr;
  12. public:
  13.     Stack(int n){
  14.         top=-1;
  15.         capacity=n;
  16.         size=0;
  17.         arr=new string[capacity];
  18.     }
  19.     bool isempty()
  20.     {
  21.         if(top==-1)
  22.         {
  23.             return true;
  24.         }
  25.         else return false;
  26.     }
  27.     string push(Stack *s,string a)
  28.     {
  29.  
  30.         s->top++;
  31.         s->arr[s->top]=a;
  32.         s->size++;
  33.         return arr[s->top];
  34.  
  35.     }
  36.     string pop(Stack *s)
  37.     {
  38.         if(isempty())
  39.         {
  40.             return "Ignored";
  41.         }
  42.         else{
  43.         string b=s->arr[s->top];
  44.         s->top--;
  45.         s->size--;
  46.         return b;
  47.         }
  48.     }
  49.     string printtop()
  50.     {
  51.         if(top==-1)
  52.         {
  53.             return "Ignored";
  54.         }
  55.         else{
  56.             string a=arr[top];
  57.             return a;
  58.         }
  59.     }
  60.     int gettop()
  61.     {
  62.         return top;
  63.     }
  64.     int sizestack(Stack *s){
  65.         return s->size;
  66.     }
  67.     void print()
  68.     {
  69.         for(int i=top;i>=0;i--)
  70.         {
  71.             cout<<arr[i]<<endl;
  72.         }
  73.     }
  74. };
  75.  
  76. int main()
  77. {
  78.     int kase=1,n;
  79.     string hold,in="http://w...content-available-to-author-only...c.bd";
  80.     Stack b(100),f(100);
  81.     b.push(&b,in);
  82.     while(cin>>in)
  83.     {    if(in=="QUIT") break;
  84.          if(in=="VISIT")
  85.          {
  86.              cin>>in;
  87.              cout<<in<<endl;
  88.              b.push(&b,in);
  89.              while(!f.isempty()){
  90.                     f.pop(&f);
  91.              }
  92.          }
  93.          else if(in=="BACK" && b.sizestack(&b)>1)
  94.          {
  95.              hold=b.printtop();
  96.              b.pop(&b);
  97.              cout<<b.printtop()<<endl;
  98.              f.push(&f,hold);
  99.          }
  100.          else if(in=="FORWARD" && !f.isempty())
  101.          {
  102.              b.push(&b,f.printtop());
  103.              cout<<f.printtop()<<endl;
  104.             f.pop(&f);
  105.          }
  106.          else
  107.          {
  108.              cout<<"Ignored\n";
  109.          }
  110.     }
  111. }
  112.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/c9ZFS7
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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