View Compilation Error

0_0_22709221_13574.cpp:7:1: error: 'unorderd_map' does not name a type
 unorderd_map<int,int> N;
 ^
0_0_22709221_13574.cpp: In function 'int main()':
0_0_22709221_13574.cpp:40:29: error: 'N' was not declared in this scope
         S.clear();M.clear();N.clear();
                             ^