/in/foo.cc: In member function 'void node::split(int, node*&, node*&)':
/in/foo.cc:41:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(k <= l->c) {
      ~~^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:122:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'LL {aka long long int}' [-Wformat=]
    printf("%d\n",comp(x,y));
                           ^