Compilare: main.cpp: In constructor 'Dijkstra::Dijkstra(long long int)': main.cpp:45:13: warning: unused variable 'i' [-Wunused-variable] int i; ^ main.cpp: In member function 'void Dijkstra::djk(std::vector<std::vector<std::pair<long long int, long long int> > >&, long long int, long long int)': main.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i< g[act.first].size();i++) ~^~~~~~~~~~~~~~~~~~~~~ main.cpp:49:12: warning: unused variable 'flag_path' [-Wunused-variable] bool flag_path=0; ^~~~~~~~~