View Compilation Error

0_0_36877263_20600.cpp:11:1: error: 'hash_map' does not name a type
 hash_map<ll,set<ll> >num;
 ^
0_0_36877263_20600.cpp:12:1: error: 'hash_map' does not name a type
 hash_map<ll,int>tt;
 ^
0_0_36877263_20600.cpp:13:1: error: 'hash_map' does not name a type
 hash_map<ll,int>inx;
 ^
0_0_36877263_20600.cpp: In function 'int main()':
0_0_36877263_20600.cpp:21:9: error: 'num' was not declared in this scope
         num.clear();
         ^
0_0_36877263_20600.cpp:22:9: error: 'tt' was not declared in this scope
         tt.clear();
         ^
0_0_36877263_20600.cpp:23:9: error: 'inx' was not declared in this scope
         inx.clear();
         ^