Compilare: main.cpp: In function 'std::vector<int> BFS(int, int, int*, int*, std::vector<std::pair<int, int> >*)': main.cpp:50:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i = 0; i < adjList[x].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:110:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 110 | for (int i = 0; i < edges.size() && cnt != N - 1; i++) { | ~~^~~~~~~~~~~~~~ main.cpp:88:9: warning: unused variable 'Q' [-Wunused-variable] 88 | int Q, N, M; | ^ main.cpp: In function 'std::vector<int> BFS(int, int, int*, int*, std::vector<std::pair<int, int> >*)': main.cpp:41:16: warning: control reaches end of non-void function [-Wreturn-type] 41 | queue<int> queue; | ^~~~~