Assuming deq is a deque object, the expression deq.push_front(elem) deletes the first element from deq.
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Q13: The function copy can copy the elements
Q14: The term deque stands for double-ended queue.
Q15: The deque class is a type of
Q16: Elements can be inserted in the middle
Q17: The class deque contains only one constructor.
Q19: Assuming deq is a deque object. the
Q20: Forward iterators combine all of the functionality
Q21: An iterator of the type const_iterator is
Q22: An iterator works like a pointer.
Q23: Every container contains the typedef reverse_iterator.
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