/in/foo.cc: In function 'int wood(int, int)':
/in/foo.cc:6:16: error: 'sort' was not declared in this scope
  sort(a+1,a+n+1);
                ^
/in/foo.cc:14:13: warning: left operand of comma operator has no effect [-Wunused-value]
   return (n,m);
             ^