View Compilation Error

0_0_31474706_27733.cpp: In function 'int main()':
0_0_31474706_27733.cpp:12:2: error: 'hash_map' was not declared in this scope
  hash_map<int, int>m;
  ^
0_0_31474706_27733.cpp:12:2: note: suggested alternative:
In file included from 0_0_31474706_27733.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/backward/hash_map:83:11: note:   '__gnu_cxx::hash_map'
     class hash_map
           ^
0_0_31474706_27733.cpp:12:11: error: expected primary-expression before 'int'
  hash_map<int, int>m;
           ^