Compilare: main.cpp: In function 'int main()': main.cpp:63:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for (int i = 0; i < neighbours[node].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:163:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 163 | for (int i = 0; i < positions.size(); i++) | ~~^~~~~~~~~~~~~~~~~~