/in/foo.cc: In function 'int main()':
/in/foo.cc:69:27: warning: array subscript has type 'char' [-Wchar-subscripts]
   mid[cnt1++] = mhash[temp];
                           ^
/in/foo.cc:72:28: warning: array subscript has type 'char' [-Wchar-subscripts]
   ceng[cnt2++] = mhash[temp];
                            ^
/in/foo.cc:74:6: warning: 'posa' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int posa;
      ^~~~