View Compilation Error

0_0_38615443_11232.cpp:10:1: error: 'gp_hash_table' does not name a type
 gp_hash_table<ll, int> mp;
 ^~~~~~~~~~~~~
0_0_38615443_11232.cpp: In function 'void init()':
0_0_38615443_11232.cpp:17:3: error: 'mp' was not declared in this scope
   mp[f[i]] = i;
   ^~
0_0_38615443_11232.cpp: In function 'void solve()':
0_0_38615443_11232.cpp:50:10: error: 'mp' was not declared in this scope
  cout << mp[res] << '\n';
          ^~