C++ STL Deque

The Duque Use :

 //STL CONTAINER Deque  
 #include <bits/stdc++.h>  
 #define p_d_i(d) for(deque<int>::iterator it= d.begin();it!=d.end();it++)cout<<*it<<" ";cout<<endl;  
 using namespace std;  
 int main()  
 {  
   //same as vector  
   deque<int>d1;  
   deque<int>d2(7,89);  
   deque<int>d3(d2.begin()+2,d2.end()-1);  
   deque<int>d4(d2);  
   if(d1.empty())  
     cout<<"d1 is empty!\n";  
   cout<<d2[3]<<endl;  
   deque<int>d5(9); //size:9 all 0s  
   cout<<"Size of d5 is "<<d5.size()<<endl;  
   p_d_i(d5);  
   d4.push_back(13);  
   d4.push_back(52);  
   d4.push_front(976);  
   d4.push_front(56);  
   p_d_i(d4);  
   d4.pop_back();  
   p_d_i(d4);  
   d4.pop_front();  
   p_d_i(d4);  
   return 0;  
 } 

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 //STL CONTAINER Deque  
 #include <bits/stdc++.h>  
 #define p_d_i(d) for(deque<int>::iterator it= d.begin();it!=d.end();it++)cout<<*it<<" ";cout<<endl;  
 using namespace std;  
 int main()  
 {  
   //same as vector  
   deque<int>d1;  
   deque<int>d2(7,89);  
   deque<int>d3(d2.begin()+2,d2.end()-1);  
   deque<int>d4(d2);  
   if(d1.empty())  
     cout<<"d1 is empty!\n";  
   cout<<d2[3]<<endl;  
   deque<int>d5(9); //size:9 all 0s  
   cout<<"Size of d5 is "<<d5.size()<<endl;  
   p_d_i(d5);  
   d4.push_back(13);  
   d4.push_back(52);  
   d4.push_front(976);  
   d4.push_front(56);  
   p_d_i(d4);  
   d4.pop_back();  
   p_d_i(d4);  
   d4.pop_front();  
   p_d_i(d4);  
   d4.insert(d4.begin()+4,-12345);  
   d4.erase(d4.end()-1);  
   p_d_i(d4);  
   d4.erase(d4.end()-5);//Clear when erasing elements  
   //erase(begin) deletes the first element . But end -1 deletes the last element  
   p_d_i(d4);  
   d4.push_front(0);  
   p_d_i(d4);  
   d4.erase(d4.begin()); //deletes the first element  
   d4.push_back(67);  
   p_d_i(d4);  
   d4.erase(d4.end()-1); //deletes the last element  
   p_d_i(d4);  
   d4.clear();  
   if(d4.empty())  
     cout<<"d4 is empty too!\n";  
   return 0;  
 }