Compilare: main.cpp: In function 'int main()': main.cpp:57:23: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 57 | while (sol.size() < N-1) | ~~~~~~~~~~~^~~~~ main.cpp:72:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (int i = 0; i<sol.size(); ++i) | ~^~~~~~~~~~~