Compilare: main.cpp: In function 'std::vector<int> bfs(int, std::vector<std::vector<int> >)': main.cpp:18:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0; i < v[x].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:68:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(int i = 0; i < ans.size(); i++) | ~~^~~~~~~~~~~~