mystl_hash.h

这是一种很好的SAT解析器。通过它

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//such a pain in the a$$ 
#ifdef __GNUC__
  #if __GNUC__ == 2 
    #include <hash_set>
    #include <hash_map>
  #elif __GNUC__ == 3
    #include <ext/hash_set>
    #include <ext/hash_map>
    #if __GNUC_MINOR__ >= 2
      using namespace __gnu_cxx;
    #endif
  #endif
#else
  #include <hash_set>
  #include <hash_map>
#endif