View Compilation Error

0_0_16076444_29057.cpp: In function 'void fft(int*, int, int)':
0_0_16076444_29057.cpp:22:43: error: 'P' was not declared in this scope
   int h = m >> 1, wm = Pow (g, ty == 1 ? (P - 1) / m : (P - 1) / m * (m - 1));
                                           ^
0_0_16076444_29057.cpp:22:77: error: 'Pow' was not declared in this scope
   int h = m >> 1, wm = Pow (g, ty == 1 ? (P - 1) / m : (P - 1) / m * (m - 1));
                                                                             ^