/in/foo.cc: In function 'int main()':
/in/foo.cc:42:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while (numb.size() < k)
         ~~~~~~~~~~~~^~~
/in/foo.cc:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0;i < numb.size();i++)
                 ~~^~~~~~~~~~~~~
/in/foo.cc:65:9: warning: statement has no effect [-Wunused-value]
   for (i;i != n.end();i++)
         ^