/in/foo.cc: In function 'int main()':
/in/foo.cc:98:32: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare]
   98 |     for (unsigned int i = 0; i <= ed - 1; i++)
      |                              ~~^~~~~~~~~
/in/foo.cc:102:44: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare]
  102 |             for (unsigned int j = i + 1; j <= ed; j++)
      |                                          ~~^~~~~
/in/foo.cc:106:86: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  106 |                 if (boat1[0] == 0 && flag[j] && boat1[0] != boat2[0] && tmp2.count() <= m)
      |                                                                         ~~~~~~~~~~~~~^~~~