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#include 
#include 
using namespace std;

int main()
   {
   deque deq;

   deq.push_back(30);
   deq.push_back(40);
   deq.push_back(50);
   deq.push_front(20);
   deq.push_front(10);

   deq[2] = 33;                    

   for(int j=0; j