View Compilation Error

0_0_30210483_20554.cpp: In function 'int main()':
0_0_30210483_20554.cpp:12:2: error: 'hash_map' was not declared in this scope
  hash_map<string, int> mp;
  ^
0_0_30210483_20554.cpp:12:2: note: suggested alternative:
In file included from 0_0_30210483_20554.cpp:1:0:
GCC4.9.2/x86_64-w64-mingw32/include/c++/backward/hash_map:83:11: note:   '__gnu_cxx::hash_map'
     class hash_map
           ^
0_0_30210483_20554.cpp:12:17: error: expected primary-expression before ',' token
  hash_map<string, int> mp;
                 ^
0_0_30210483_20554.cpp:12:19: error: expected primary-expression before 'int'
  hash_map<string, int> mp;
                   ^
0_0_30210483_20554.cpp:16:3: error: 'mp' was not declared in this scope
   mp.clear();
   ^