View Compilation Error

0_0_39471358_18245.cpp:21:1: error: 'unordered_map' does not name a type
   21 | unordered_map <ull,int> mp;
      | ^~~~~~~~~~~~~
0_0_39471358_18245.cpp: In function 'void clear()':
0_0_39471358_18245.cpp:39:9: error: 'mp' was not declared in this scope; did you mean 'p'?
   39 |         mp.clear(); ans=0;
      |         ^~
      |         p
0_0_39471358_18245.cpp: In function 'int main()':
0_0_39471358_18245.cpp:75:25: error: 'mp' was not declared in this scope; did you mean 'p'?
   75 |                         mp[v[i]]++;
      |                         ^~
      |                         p
0_0_39471358_18245.cpp:77:26: error: 'mp' was not declared in this scope; did you mean 'p'?
   77 |                 for(it i=mp.begin();i!=mp.end();++i) ans+=i->second*(i->second-1)/2;
      |                          ^~
      |                          p
0_0_39471358_18245.cpp:89:40: error: 'mp' was not declared in this scope; did you mean 'mk'?
   89 |                                 int mk=mp[v[t]]; //cout<<"red"<<mk<<endl;
      |                                        ^~
      |                                        mk