error C2679: binary ‘<<' : no operator found which takes a right-hand operand of type 'std::string' (or there is no acceptable conversion)

You forgot to #include <string>

using std::string without including it’s header works on some compilers that indirectly import parts of <string> into their <iostream> or other headers but that’s not standard and shouldn’t be relied upon. Also they often break when you try to output a string since they only included a part of the implementation and are missing the part that implements the operator<<.

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