Compilare: main.cpp: In function 'void dijkstra()': main.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i=0; i<v[a.first].size(); i++) | ~^~~~~~~~~~~~~~~~~~ main.cpp:26:17: warning: unused variable 'x' [-Wunused-variable] 26 | int x=a.first; | ^