/in/foo.cc: In function 'void read(long long int&)':
/in/foo.cc:11:49: error: lvalue required as left operand of assignment
  for(;c>47&&c<58;c=getchar())-k=(k<<3)+(k<<1)+c-48;
                                                 ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:28:17: error: 'get_mu' was not declared in this scope
  read(T),get_mu();
                 ^