View Compilation Error

0_0_14529123_5973.cpp: In function 'long long int discrete_log(int, int, int)':
0_0_14529123_5973.cpp:33:55: error: 'pow_mod' was not declared in this scope
         long long more=(long long )n*pow_mod(cur,m-2,m)%m;
                                                       ^