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C++: using std::vector; https://en.cppreference.com/w/cpp/language/namespace#Using-directives https://en.cppreference.com/w/cpp/language/namespace#Using-d..

C++: using std::vector; https://en.cppreference.com/w/cpp/language/namespace#Using-directives https://en.cppreference.com/w/cpp/language/namespace#Using-d...