在Linux的STL中用hash_map

#ifdef __GNUC__
#include <ext/hash_map>
#else
#include <hash_map>
#endif

namespace std
{
using namespace __gnu_cxx;
}

using  namespace std;
int main()
{

//std::hash_map<int,int> hm;
hash_map<int,int> hm;

return 0;
}