/in/foo.cc: In function 'bool dfs(int)':
/in/foo.cc:21:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   21 |         return result.size() == n / 2; // 确保人数正确
      |                ~~~~~~~~~~~~~~^~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:76:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for (int i = 0; i < result.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~