/in/foo.cc: In function 'int main()':
/in/foo.cc:27:14: error: 'sort' was not declared in this scope
  sort(b,b + i);
              ^
/in/foo.cc:28:6: error: redeclaration of 'int k'
  int k = 0;
      ^
/in/foo.cc:14:6: note: 'int k' previously declared here
  int k = 1;
      ^