Compilare: main.cpp: In function 'void BFS(int)': main.cpp:140:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 140 | for(i=0;i<v[k].size();i++){ | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:175:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 175 | for(j=0;j<v[i].size();j++){ | ~^~~~~~~~~~~~