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Alex Rivera
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in c++ 11 if we have a set<int> S ; we could say: for (auto i: S) cout << i << endl; but can we force i to be a iterator, I mean write a code that is equivalent to: for (auto i = S.begin(); i != S.end(); i++) cout << (i != s.begin()) ? " " : "" << *i; or could we do something that we can understand the index of i in the set(or vector)? and another question is how could we say that don't do this for all elements in S but for first half of them or all of them except the first one. or when we have a vector<int> V , and want to print its first n values what should we do? I know we can create a new vector but it takes time to copy a vector to a new vector.
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