Compilare: main.cpp: In function 'bool bfs()': main.cpp:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(i=0;i<vec[nod].size();++i) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(i=0;i<vec[n].size();++i) | ~^~~~~~~~~~~~~~