Redo (or do for the first time) Programming Project 12 from Chapter 11,
except use the STL set template class instead of your own set class. Use
the generic set_intersection function to compute the intersection of Q
and D.
Here is an example of set_intersection to intersect set A with B and
store the result in C, where all sets are sets of strings:
#include <set>
#include <string>
...
set<string> C;
// Note space between > > in line below
insert_iterator<set<string> > cIterator(C, C.begin());
set_intersection(A.begin(), A.end(),
B.begin(),B.end(),
cIter);
// set C now contains the intersection of A and B
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