/in/foo.cc: In function 'bool canReachTerminal(int)':
/in/foo.cc:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     for (int i = 0; i < adj[u].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int dfs(int)':
/in/foo.cc:57:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for (int i = 0; i < adj[u].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:163:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  163 |                 for (int i = 0; i < adj[u].size(); i++) {
      |                                 ~~^~~~~~~~~~~~~~~
/in/foo.cc:177:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  177 |                 for (int i = 0; i < adj[u].size(); i++) {
      |                                 ~~^~~~~~~~~~~~~~~
/in/foo.cc:192:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  192 |                 for (int i = 0; i < adj[u].size(); i++) {
      |                                 ~~^~~~~~~~~~~~~~~
/in/foo.cc:208:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  208 |                     for (int i = 0; i < adj[u].size(); i++) {
      |                                     ~~^~~~~~~~~~~~~~~
/in/foo.cc:224:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  224 |                     for (int i = 0; i < adj[u].size(); i++) {
      |                                     ~~^~~~~~~~~~~~~~~