View Compilation Error

0_0_36581608_1017.cpp:11:1: error: 'hash_map' does not name a type
 hash_map<ll, int>ans, las;
 ^
0_0_36581608_1017.cpp: In function 'void work()':
0_0_36581608_1017.cpp:13:5: error: 'ans' was not declared in this scope
     ans.clear();
     ^
0_0_36581608_1017.cpp:15:5: error: 'las' was not declared in this scope
     las.clear();
     ^