/in/foo.cc: In function 'int main()':
/in/foo.cc:120:42: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  120 |                 if ( bl && (tmp2.count() <= m-1))
      |                             ~~~~~~~~~~~~~^~~~~~