Compilare: main.cpp: In function 'int main()': main.cpp:140:23: 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] 140 | for (int i = 0; i < sccs.size(); i++) { | ~~^~~~~~~~~~~~~ main.cpp:142:27: 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] 142 | for (int j = 0; j < sccs.size(); j++) { | ~~^~~~~~~~~~~~~ main.cpp:150:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 150 | for (int j = 0; j < sccs[minimum_index].second.size(); j++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:139:9: warning: unused variable 'index' [-Wunused-variable] 139 | int index = 0; | ^~~~~