Compilare: main.cpp: In function 'void dijkstra()': main.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(i=0; i<lista[a].size(); i++) | ~^~~~~~~~~~~~~~~~