Compilare: main.cpp: In function 'void dfs(int)': main.cpp:18:22: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | if(g[it] < vecini[a].size()) mex[g[it]] = 1; main.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0 ; i <= vecini[a].size() ; i++) | ~~^~~~~~~~~~~~~~~~~~~