这是C++交的
    * Compile Error

      Main.cpp
      Main.cpp(3) : error C2871: 'std' : a namespace with this name does not exist

下面这个是用G++交的
    * Compile Error

      Main.cc:2:20: error: memory.h: No such file or directory
      Main.cc: In function 'int main()':
      Main.cc:19: error: 'memset' was not declared in this scope

这个也是用G++交的，不过头文件改成了#include <memory>
    * Compile Error

      Main.cc: In function 'int main()':
      Main.cc:19: error: 'memset' was not declared in this scope