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# 1 Preface stl, as a well-encapsulated and qualified c++ standard library, is extremely commonly used in algorithm competitions. Flexible and correct use of stl can save a lot of problem solving time, not only because it can be called directly, but also because it encapsulates. How to handwrite a tiny stl from scratch? The questioner has some basic knowledge of C++. After recently learning data structures, I want to write a simple STL. I don’t know where to start? Can writing stl improve my c++ level? Ask for guidance from experts! if.