Yingzhi Zhao

Add auto-completion for builtin functions

2

### Feature Request I use `__builtin_popcount` and other builtin functions frequently, but they do not have auto-completions, I have to type a whole function name when using them. Could you...

Since ac-library doesn't provide functions for arbitrary modulo convolutions, I wrote an alternative. Its implementation is poor, but it's enough in most problems. ```cpp vector arbitrary_mod_convolution(const vector& v1, const vector&...