read.cc

template<typename T> inline void read(T &x){assert(false);}
template<> inline void read<int>(int &x){scanf("%d ",&x);}
template<> inline void read<ll>(ll &x){scanf("%lld ",&x);}
// template<> inline void read<ll>(ll &x){scanf("%I64d ",&x);}
template<typename Arg, typename Arg2, typename ...Args>
inline void read(Arg &x, Arg2 &y, Args& ...z){
    read<Arg>(x); read<Arg2, Args...>(y, z...);
}