View Compilation Error

0_0_38781036_308.cpp:86:1: error: 'gp_hash_table' does not name a type
   86 | gp_hash_table<int, int, custom_hash> mp;
      | ^~~~~~~~~~~~~
0_0_38781036_308.cpp: In function 'int pin(int, int, int, int, Z)':
0_0_38781036_308.cpp:122:5: error: 'mp' was not declared in this scope
  122 |     mp[xx]++;
      |     ^~
0_0_38781036_308.cpp: In function 'void solve()':
0_0_38781036_308.cpp:132:5: error: 'mp' was not declared in this scope; did you mean 'm'?
  132 |     mp.clear();
      |     ^~
      |     m