Compilare: main.cpp: In function 'int main()': main.cpp:88:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | if (nr!=nodes.size()) | ~~^~~~~~~~~~~~~~ main.cpp:97:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 97 | for (int i=0; i<sol.size(); i++) | ~^~~~~~~~~~~