Compilare: main.cpp: In function 'bool bfs()': main.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int i = 0; i < ad[x].size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for (int i = 0; i < ad[n].size(); ++i) { | ~~^~~~~~~~~~~~~~