Compilare: main.cpp: In function 'int tarjan(int, int)': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=0; i<l[u].size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int j=0; j<sol[i].size(); j++) | ~^~~~~~~~~~~~~~