View Compilation Error

0_0_38785483_18350.cpp:15:1: error: 'unordered_map' does not name a type
   15 | unordered_map<int,int>mp;
      | ^~~~~~~~~~~~~
0_0_38785483_18350.cpp: In function 'int findpos(int)':
0_0_38785483_18350.cpp:25:9: error: 'mp' was not declared in this scope; did you mean 'p'?
   25 |     if(!mp.count(x))mp[x]=++n;
      |         ^~
      |         p
0_0_38785483_18350.cpp:26:12: error: 'mp' was not declared in this scope; did you mean 'p'?
   26 |     return mp[x];
      |            ^~
      |            p
0_0_38785483_18350.cpp: In function 'int main()':
0_0_38785483_18350.cpp:33:9: error: 'mp' was not declared in this scope; did you mean 'p'?
   33 |         mp.clear();
      |         ^~
      |         p