Compilare: main.cpp: In function 'void afis2(std::ofstream&)': main.cpp:44:18: warning: unused variable 'j' [-Wunused-variable] 44 | for(auto j: ctcv[i]) | ^ main.cpp: In function 'void biconexe()': main.cpp:407:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 407 | for (int i = 0; i < componente.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~