/in/foo.cc: In function 'long long int choose(int, int, long long int)':
/in/foo.cc:10:47: error: 'modInv' was not declared in this scope
     return numerator * modInv(denominator, mod) % mod;
                                               ^
/in/foo.cc: In function 'long long int modInv(long long int, long long int)':
/in/foo.cc:14:31: error: 'pow' was not declared in this scope
     return pow(n, mod - 2, mod);
                               ^