View Compilation Error

0_0_39457533_14387.cpp:15:1: error: 'unordered_map' does not name a type
   15 | unordered_map<int,int>mpx;
      | ^~~~~~~~~~~~~
0_0_39457533_14387.cpp:16:1: error: 'unordered_map' does not name a type
   16 | unordered_map<int,int>mpy;
      | ^~~~~~~~~~~~~
0_0_39457533_14387.cpp: In function 'int main()':
0_0_39457533_14387.cpp:56:11: error: 'mpx' was not declared in this scope
   56 |     cnt++;mpx[x]=cnt;
      |           ^~~
0_0_39457533_14387.cpp:60:11: error: 'mpy' was not declared in this scope
   60 |     cnt++;mpy[y]=cnt;
      |           ^~~
0_0_39457533_14387.cpp:63:16: error: 'mpx' was not declared in this scope
   63 |         int x1=mpx[arr[a].x1];int x2=mpx[arr[a].x2];
      |                ^~~
0_0_39457533_14387.cpp:64:16: error: 'mpy' was not declared in this scope
   64 |         int y1=mpy[arr[a].y1];int y2=mpy[arr[a].y2];
      |                ^~~