foo.cc: In function 'int CNMWorld(std::vector<int>, std::__cxx11::list<int>, std::string)':
foo.cc:8:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         for(int i=0;i<s.length();i++)
      |                     ~^~~~~~~~~~~
foo.cc:10:1: warning: no return statement in function returning non-void [-Wreturn-type]
   10 | }
      | ^

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