View Compilation Error

0_0_13315750_17164.cpp:30:1: error: 'map' does not name a type
 map<ui, ui> H;
 ^
0_0_13315750_17164.cpp: In function 'ui BsGs()':
0_0_13315750_17164.cpp:69:2: error: 'H' was not declared in this scope
  H.clear(); ui x = tx, gen = (ui) sqrt((1LL << n)), times = (1LL << n) / gen;
  ^
0_0_13315750_17164.cpp: In function 'int main()':
0_0_13315750_17164.cpp:112:4: error: 'H' was not declared in this scope
    H.clear();
    ^