Deque c++

/*  A deque is a dynamic array whose size can be efficiently 
changed at both ends of the array. Like a vector, a deque provides
the functions push_back and pop_back, but it also includes the 
functions push_front and pop_front. */
deque<int> d;
d.push_back(5); // [5]
d.push_back(2); // [5,2]
d.push_front(3); // [3,5,2]
d.pop_back(); // [3,5]
d.pop_front(); // [5]

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