View Compilation Error

0_0_29605438_7009.cpp:10:1: error: 'unordered_map' does not name a type
 unordered_map<ll, bool> rec;
 ^
0_0_29605438_7009.cpp: In function 'void ini()':
0_0_29605438_7009.cpp:18:3: error: 'rec' was not declared in this scope
   rec[tmp] = true;
   ^
0_0_29605438_7009.cpp: In function 'int main()':
0_0_29605438_7009.cpp:31:6: error: 'rec' was not declared in this scope
   if(rec[tmp])
      ^