Given a map<string, vector<int>>, write the types used as an argument and as the return value for the version of insert that inserts one element
belongs to book: C++ Primer|Stanley B.Lippman, Josee Lajoie, Barbara E.Moo|5th Edition| Chapter number:11| Question number:22
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The return type is
`pair<map<string, vector<int>>::iterator, bool>`
.