Compilare: main.cpp: In function 'void bfs(int)': main.cpp:15:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int j=0;j<L[C[st]].size();j++) | ~^~~~~~~~~~~~~~~~