Compilare: main.cpp: In function 'int main()': main.cpp:146:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::vector<int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | for (int i = 0; i < sccs.size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:148:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::vector<int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 148 | for (int j = 0; j < sccs.size(); j++) { | ~~^~~~~~~~~~~~~ main.cpp:157:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 157 | for (int j = 0; j < sccs[minimum_index].second.size(); j++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:145:9: warning: unused variable 'index' [-Wunused-variable] 145 | int index = 0; | ^~~~~