/in/foo.cc: In function 'bool inBlack(int, std::vector<int>)':
/in/foo.cc:7:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < bl.size(); ++i) {
                  ~~^~~~~~~~~~~
/in/foo.cc: In function 'void doProcess()':
/in/foo.cc:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
           for (int p = 0; p < lvc.size(); ++p) {
                           ~~^~~~~~~~~~~~
/in/foo.cc:48:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
            for (int q = 0; q < lvc.size(); ++q) {
                            ~~^~~~~~~~~~~~
/in/foo.cc:49:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int r = 0; r < lvc.size(); ++r) {
                             ~~^~~~~~~~~~~~