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C++: STL container of unique elements?

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I have a project that says I need to use an array to hold the values of some strings. I can manually check to see if a vector has a value before inserting it, and this is trivial enough to implement, but I thought that maybe there was a container I haven't used before. I am still getting familiar with the language and the STL. I Googled and found a Unique Associative Container, but I don't need to be able to associate keys with something. Is there a container that would only accept new values if the value doesn't exist, or is this something that programmers are expected to handle on their own?

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