/in/foo.cc: In function 'std::vector<int> power(const std::vector<int>&, int)':
/in/foo.cc:24:30: error: cannot convert 'std::vector<int>' to 'int' for argument '2' to 'std::vector<int> mul(const std::vector<int>&, int)'
         return mul(temp, temp);
                              ^
/in/foo.cc:26:34: error: cannot convert 'std::vector<int>' to 'int' for argument '2' to 'std::vector<int> mul(const std::vector<int>&, int)'
         return mul(mul(temp, temp), base);
                                  ^