Compilare: main.cpp: In function 'bool bfs()': main.cpp:15:15: warning: variable 'elem' set but not used [-Wunused-but-set-variable] 15 | for (auto elem : viz) | ^~~~ main.cpp:19:15: warning: variable 'elem' set but not used [-Wunused-but-set-variable] 19 | for (auto elem : parents) | ^~~~ main.cpp:35:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = 0; i < graph[currentNode].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:66:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int i = 0; i < graph[n].size(); ++i) | ~~^~~~~~~~~~~~~~~~~