Compilare: main.cpp: In function 'int main()': main.cpp:83:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for (int i = 0; i < sccs.size(); ++i) { | ~~^~~~~~~~~~~~~ main.cpp:84:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for (int j = 0; j < sccs[i].size(); ++j) { | ~~^~~~~~~~~~~~~~~~