View Compilation Error

816752_0_0_15370.cpp:7: error: ISO C++ forbids declaration of `sort' with no type
816752_0_0_15370.cpp: In function `int main()':
816752_0_0_15370.cpp:32: error: cannot convert `__gnu_cxx::__normal_iterator<double*, std::vector<double, std::allocator<double> > >' to `double' for argument `1' to `int sort(double, double)'